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Recent questions tagged photoelectric-effect
Questions
One milliwatt of light of wavelength of 4560 $A^{\circ}$ is incident on a cesium surface. Calculate the electron current liberated. Assume a quantum efficiency of 0.5%.
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Jan 1, 2014
by
thanvigandhi_1
1
answer
If the speed of photoelectrons is $10^4\: m/s$, what should be the frequency of the incident radiation on a potassium metal? (work function of potassium = $2.3 eV)$
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 31, 2013
by
thanvigandhi_1
1
answer
A photosensitive metallic surface has work function, $hv_{\circ}$. If photons of energy $2hv_{\circ}$ fall on this surface, the electrons come out with a maximum velocity of $4 \times 10^6 \: m/s$. When the photon energy is increased to $5hv_{\circ}$, then maximum velocity of photoelectrons will be
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 31, 2013
by
thanvigandhi_1
1
answer
Threshold wavelength for photoelectric emission from a metal surface is 5200 $A^{\circ}$ will be emitted when this surface is illuminated with monochromatic radiation from . Photoelectrons
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 31, 2013
by
thanvigandhi_1
1
answer
Figure shows the variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 31, 2013
by
thanvigandhi_1
1
answer
A photon of energy 4 eV is incident on a metal surface whose work function is 2 eV. The minimum reverse potential to be applied for stopping the emission of electrons is
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 31, 2013
by
thanvigandhi_1
1
answer
In a series of photoelectric emission experiments, a number of different metals were illuminated with monochromatic light of a number of different photon energies and of different intensities. The variables in the experiment were thus:
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 31, 2013
by
thanvigandhi_1
1
answer
Figure shows the results of an experiment involving photoelectric effect. The graphs A,B,C,D relate to light beams having different wavelengths.
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 31, 2013
by
thanvigandhi_1
1
answer
When a monochromatic point source of light is at a distance 0.2 m from a photoelectric cell, the cut- off voltage and the saturation current are respectively 0.6 V and 18 mA. If the same source is placed 0.6 m away from the photocell, then choose the correct option:
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 31, 2013
by
thanvigandhi_1
1
answer
Which of the following statements is not in support of the quantum nature of light?
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 31, 2013
by
thanvigandhi_1
1
answer
S1: If the accelerating potential of an electron is doubled then its velocity becomes 1.4 times. S2: It will move on a circular path with same velocity.
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 30, 2013
by
thanvigandhi_1
1
answer
S1 : When ultraviolet light is incident on a photocell, its stopping potential is $V_{\circ}$ and the maximum kinetic energy of the photoelectrons is $K_{max}$ increase. . When the ultraviolet light is replaced by x-rays, both $V_{\circ}$ and $ K_{max}$ S2 : Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light.
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 30, 2013
by
thanvigandhi_1
1
answer
When radiation falls on plate C, the ammeter reading remains zero till jockey is moved from the end P to the middle point of the wire PQ. Therefore the deflection is recorded in the ammeter. The maximum kinetic energy of the emitted electron is :
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 30, 2013
by
thanvigandhi_1
1
answer
Which of the given colors do not show photoelectric effect from this experiment?
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 30, 2013
by
thanvigandhi_1
1
answer
If no radiation is falling on plate C, the number of electrons appeared on the surface of cathode C when jockey is connected at end P of the rheostat is
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 30, 2013
by
thanvigandhi_1
1
answer
The anode voltage of a photocell is kept fixed. The wavelength $ \lambda$ of the light falling on the cathode is gradually changed. The plate current vs. $ \lambda$ curve is
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
difficult
asked
Dec 30, 2013
by
thanvigandhi_1
1
answer
In a photocell experiment, a convex lens is used to focus the light beam. Current strength is I. If the lens is replaced by another lens of half diameter, but same focal length, photoelectric current will be
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 28, 2013
by
thanvigandhi_1
1
answer
Maximum velocity of the photoelectrons emitted by a metal surface is $1.2 \times 10^6 m/s$. Assuming the specific charge of the electron to be $1.8 \times 10^{11}C/kg$, the value of the stopping potential is
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 28, 2013
by
thanvigandhi_1
1
answer
When light of wavelength 300 nm falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, light of wavelength 600 nm is sufficient for liberating photoelectrons. The ratio of the work function of the two emitters is
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 28, 2013
by
thanvigandhi_1
1
answer
When photons of energy hv fall on an aluminum plate (of work function $E_{\circ}$) photoelectrons of maximum $KE,\: K$ are ejected. If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 28, 2013
by
thanvigandhi_1
1
answer
A photocell employs photoelectric effect to convert
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 28, 2013
by
thanvigandhi_1
1
answer
In photoelectric effect, the number of electrons ejected per second is
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 28, 2013
by
thanvigandhi_1
1
answer
Relation of the stopping potential $V_{\circ}$ of a metal and the maximum velocity $v$ of the photoelectrons
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 28, 2013
by
thanvigandhi_1
1
answer
Graph of $KE_{max}$ of the photoelectrons against v the frequency of the radiation incident on the metal is a straight line of slope equal to: , i
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 28, 2013
by
thanvigandhi_1
1
answer
If in a photoelectric experiment, the wavelength of incident radiation is reduced from $6000\: A^{\circ} \: to \: 4000\: A^{\circ}$ , then
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 28, 2013
by
thanvigandhi_1
1
answer
What is the effect of increasing the intensity of light that falls on the emitter in a photoelectric effect apparatus?
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 27, 2013
by
thanvigandhi_1
1
answer
Which statement is incorrect regarding photoelectric effect?
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 27, 2013
by
thanvigandhi_1
1
answer
Two identical photo cathodes receive light of frequencies $f_1\: and \: f_2$. If velocities of photoelectrons (of mass m) coming out are respectively $v_1\: and\: v_2$, then
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 27, 2013
by
thanvigandhi_1
1
answer
According to Einstein’s photoelectric equation, the plot of the KE of the emitted photoelectrons from a metal vs the frequency of the incident radiation gives a straight line whose slope
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 27, 2013
by
thanvigandhi_1
1
answer
The work function of a substance is $4.0\: eV$. The longest wavelength of light that can cause photoelectron emission from this substance is approximately
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 27, 2013
by
thanvigandhi_1
1
answer
A photoelectric cell is illuminated by a small bright source of light placed at 1m. If the same source of light is placed 2m away, the electrons emitted by the cathode
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 27, 2013
by
thanvigandhi_1
1
answer
Light of wavelength $0.6\: \mu m$ from a sodium lamp falls on a photocell and causes the emission of photoelectrons for which the stopping potential is $0.5\: V$ and with light of wavelength $0.4\: \mu m$ from a sodium lamp, the stopping potential is $1.5\: V$. With this data, the value of $ \large\frac{h}{e}$ will be
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 27, 2013
by
thanvigandhi_1
1
answer
When a light of wavelength $300\: nm$ falls on a photoelectric emitter, the photoelectrons are liberated. For another emitter, the light of wavelength $600\: nm$ is sufficient for liberating photoelectrons. The ratio of the work function of the two emitters, is
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 27, 2013
by
thanvigandhi_1
1
answer
From this figure describing photoelectric effect, we may infer correctly that :
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 27, 2013
by
thanvigandhi_1
1
answer
Monochromatic radiation of wavelength $640.2\: nm$ from a neon lamp irradiates photosensitive material made of cesium on tungsten. The stopping voltage is measured to be $0.54\: V$. The source is replaced by an iron source and its $427.2\: nm$ light irradiates then same photocell. Predict the new stopping voltage.
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 25, 2013
by
thanvigandhi_1
1
answer
Ultraviolet light of wavelength $2271\: A^{\circ}$ from a $100\: W$ mercury source irradiates a photocell made of molybdenum metal. If the stopping potential is $-1.3\: V$,will the photocell respond to a high intensity $(10^{-5}W/m^2)$ red light of wavelength $632.8\: A^{\circ}$ produced by a He-Ne laser?
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 25, 2013
by
thanvigandhi_1
1
answer
Light of wavelength $488\: nm$ is produced by an argon laser which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the cut-off potential of photoelectrons is $0.38\: V$. The work function of the material from which the emitter is made is
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 24, 2013
by
thanvigandhi_1
1
answer
In an experiment on photoelectric effect, the slope of the cut-off voltage versus frequency of incident light is found to be $4.12 \times 10^{-15}Vs$. Calculate the value of Planck’s constant.
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
medium
asked
Dec 24, 2013
by
thanvigandhi_1
1
answer
Emission of photoelectrons from a metal plate illuminated with monochromatic electromagnetic radiation will always take place provided
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 24, 2013
by
thanvigandhi_1
1
answer
A point source of light is taken away from the experimental setup of photoelectric effect, then which is the most appropriate statement?
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 24, 2013
by
thanvigandhi_1
1
answer
A source of light is placed at a distance $x$ from a photocell and cut off potential is $V$. If the distance of the same source from the photocell is doubled, then cut off potential will be :
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 24, 2013
by
thanvigandhi_1
1
answer
Blue light can cause photoelectric emission from a metal, but yellow light cannot. If red light is incident on the metal, then
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 24, 2013
by
thanvigandhi_1
1
answer
The maximum energy of the electrons released in photocell is independent of
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 24, 2013
by
thanvigandhi_1
1
answer
The work functions for metals A, B and C are respectively $1.92\: eV, 2\: eV \: and \: 5 \: eV$. According to Einstein’s equation, the metals which will emit photoelectrons for a radiation of wavelength $4100\: A^{\circ} $ is / are
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 23, 2013
by
thanvigandhi_1
1
answer
The photoelectric effect is based on
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 23, 2013
by
thanvigandhi_1
1
answer
The time taken by a photoelectron to come out after the photon strikes is approximately
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 23, 2013
by
thanvigandhi_1
1
answer
The work function of the following metals are : $Na = 2.75\: eV; K = 2.3\: eV ; Mo = 4.17\: eV ; Ni = 5.15 \: eV$. Which of these metals will not give photoelectric emission for a radiation of wavelength $3300\: A^{\circ}$ the photocell? from a $ He – Cd$ laser placed $1m$ away from
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 23, 2013
by
thanvigandhi_1
1
answer
The threshold frequency for a certain metal is $3.3 \times 1014Hz$. If light of frequency $8.2 \times 1014 Hz$ is incident on the metal, predict the cutoff voltage for the photoelectric emission.
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 23, 2013
by
thanvigandhi_1
1
answer
The photoelectric cut-off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons emitted ?
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 23, 2013
by
thanvigandhi_1
1
answer
The work function of caesium metal is $2.14 \;eV$. When light of frequency $ 6 \times 10^{14}Hz$ is incident on the metal surface , photoemmision of electron occurs. What is the stopping potential of the emitted photoelectrons ?
jeemain
physics
dual-nature-matter-radiation
cbse
class12
photoelectric-effect
easy
asked
Dec 23, 2013
by
thanvigandhi_1
1
answer
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