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Recent questions tagged ch11
Questions
The number of photons entering the pupil of our eye per second corresponding to the minimum intensity of white light that we humans can perceive . Take the area of the pupil to be about $0.4\;cm^2$ and the average frequency of white light to be found $6 \times 10^4 Hz$
cbse
class12
physics
ch11
sec-b
ncert
medium
asked
Jun 27, 2016
by
meena.p
1
answer
Estimate the number of photons emitted per second by a Mw transmitter of 10 Kw power emitting radio waves of length 500 m
cbse
class12
physics
ch11
sec-b
ncert
medium
asked
Jun 27, 2016
by
meena.p
1
answer
In an acceleration experiment on high energy collision of electrons with position , a certain event is interpreted as annihilation of an electron position pair of total energy $10.2\;Bev$ into two $\gamma$ rays of equal energy. What is the wave length associated with each $\gamma$- ray $(1Bev= 10^9\;ev)$ ?
cbse
class12
physics
ch11
sec-b
ncert
easy
asked
Jun 27, 2016
by
meena.p
1
answer
An x-ray tube produces a continuous spectrum of radiation with its short wave length end at $0.45 A^{\circ}$ give what order of accelerating voltage (for electron ) is required in such a tube .
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 27, 2016
by
meena.p
1
answer
An x-ray tube produces a continuous spectrum of radiation with its short wave length end at $0.45 A^{\circ}$ what is the maximum energy of a photon in the radiation ?
cbse
class12
physics
ch11
sec-b
ncert
medium
asked
Jun 27, 2016
by
meena.p
1
answer
An electron gun with its anode at a potential $100\;v$ fires out electrons in a spherical bulls containing hydrogen gas at low pressure $(10^{-2}\;mm\;of\;Hg)$ . A magnetic field of $2.83 \times 10^{-4}\;T$ curves the path of the electron in a circular orbit of radius 12.0 cm (The path can be viewed because the gas ions in the path focus the beam by attracting electrons and emitting light by electron capture. this method is known as "fine beam tube " method. Determine e/m from the data .
cbse
class12
physics
ch11
sec-b
ncert
medium
asked
Jun 24, 2016
by
meena.p
1
answer
A mono energetic electron beam with electron speed of $5.20 \times 10^6 ms^{-1}$ is subjected to a mognetic field of $1.30 \times 10^{-4}\;T$ , normal to the beam velocity .What is the radius of the circle traced by the beam , given $\large\frac{e}{m}$ for electron equals $1.76 \times 10^{11} ckg^{-1}$Is the formula you employ valid for calculating radius of the path of 20 Mev electron beam ? If not in what way is it modified ?
cbse
class12
physics
ch11
sec-b
ncert
medium
asked
Jun 24, 2016
by
meena.p
1
answer
A mono energetic electron beam with electron speed of $5.20 \times 10^6 ms^{-1}$ is subjected to a mognetic field of $1.30 \times 10^{-4}\;T$ , normal to the beam velocity .What is the radius of the circle traced by the beam , given $\large\frac{e}{m}$ for electron equals $1.76 \times 10^{11} ckg^{-1}$
cbse
class12
physics
ch11
sec-b
ncert
medium
asked
Jun 24, 2016
by
meena.p
1
answer
Estimate the speed with which electron emitted from a heated cathode of an evacuated tube impinge on the anode maintained at a potential difference of $500\;v$ , with respect to the cathod . Ignore the small initial speeds of the electrons . The specific charge of the electron (ie) its $\large\frac{e}{m}$ is given to be $1.76 \times 10^{11}\;kg^{-1}$ use the same formula you employ to obtain electron speed for an anode potential of 10 Mv. Do you see what is wrong ? In what way in is the formula to be modified ?
cbse
class12
physics
ch11
ncert
difficult
sec-e
asked
Jun 24, 2016
by
meena.p
1
answer
Estimate the speed with which electron emitted from a heated cathode of an evacuated tube impinge on the anode maintained at a potential difference of $500\;v$ , with respect to the cathode . Ignore the small initial speeds of the electrons . The specific charge of the electron (ie) its $\large\frac{e}{m}$ is given to be $1.76 \times 10^{11}\;kg^{-1}$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 24, 2016
by
meena.p
1
answer
What is the de-Broglie wavelength of a nitrogen molecule in air at $300\;K$ Assume that the molecule that the molecule is moving with the root- means - square speed of molecules at this temperature ? (Atomic mass of nitrogen = $14.0076\;u$) given : $h= 6.63 \times 10^{-34}\;Js,m_n= 1.675 \times 10^{-27}\;kg; k= 1.8 \times 10^{-23}JK^{-1}$
cbse
class12
physics
ch11
sec-b
ncert
medium
asked
Jun 24, 2016
by
meena.p
1
answer
Show that the wave length of electro magnetic radiation is equal to the de-Broglie wave length of its quantum (photon)
cbse
class12
physics
ch11
sec-a
ncert
medium
asked
Jun 23, 2016
by
meena.p
1
answer
Find the de-Broglie wavelength of a neutron , in thermal equilibrium with matter, having an average kinetic energy of $ \large\frac{3}{2}$$kT$ at $300k$ .given : $h= 6.63 \times 10^{-34}\;Js,m_n= 1.675 \times 10^{-27}\;kg; k= 1.8 \times 10^{-23}JK^{-1}$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
For what kinetic energy of a neutron will the associated de-Broglie wave length be $1.40 \times 10^{-10}\;m$ given : $h= 6.63 \times 10^{-34}\;Js,m_n= 1.675 \times 10^{-27}\;kg; k= 1.8 \times 10^{-23}JK^{-1}$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
An electron and a photon each have a wave length of $1.00\;nm$ calculate the kinetic energy of the electron .given $h= 6.63 \times 10^{-34}\;Js,m_e= 9 \times 10^{-31}\;kg$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
An electron and a photon each have a wave length of $1.00\;nm$ calculate the energy of the photon. $h= 6.6 \times 10^{-34}\;Js,m_e= 9 \times 10^{-31}\;kg$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
An electron and a photon each have a wave length of $1.0\;nm$ . Find their momentum. $(h= 6.6 \times 10^{-34}\;Js)$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
What is the de-Breglie wave length of a dust particle of mass $1.0 \times 10^{-9}\;kg$ drifting with a speed of $2.2ms^{-1}$? $(h= 6.6 \times 10^{-34}\;Js)$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
What is the de-Broglie wave length of a ball of mass $0.060\;kg$ moving at a speed of $1.0ms^{-1} $?
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
What is the de-Broglie wave length of a bullet of mass $0.040\;kg$ travelling at the speed of $1.0kms^{-1}$? $h= 6.63 \times 10^{-34}\;Js$
cbse
class12
physics
ch11
sec-a
ncert
medium
asked
Jun 23, 2016
by
meena.p
1
answer
The wave length of light from the spectral emission line of sodium is $589\;nm$ . Find the kinetic energy at which a neutrals would have the same de - Broglie wavelength . given $(h= 6.6 \times 10^{-34}\;Js, mn=1.66 \times 10^{-27}\;kg)$
cbse
class12
physics
ch11
sec-b
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
The wave length of light from the spectral emission line of sodium is $589\;nm$ . Find the kinetic energy at which an electron would have the same de- Brojlie wavelength . given $(h= 6.6 \times 10^{-34}\;Js, me= 9 \times 10^{-31}kg, \; m_n =1.66 \times 10^{27}\;kg)$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
What is the de- Broglie wave length of an electron with kinetic energy of $120 ev$ given $(h= 6.63 \times 10^{-34}\;Js, me= 9 \times 10^{-31}kg, \; lev =1.6 \times 10^{-19}\;J)$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
What is the speed of an electron with kinetic energy of $120\;eV$ given $h= 6.63 \times 10^{-34} \;Js, \;m_e= 9 \times 10^{-31} kg,lev= 1.6 \times 10^{-19}\;J$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
What is the momentum of an electron with kinetic energy of $120\; ev$ given $(h= 6.63 \times 10^{-34}\;Js, lev =1.6 \times 10^{-19}\;J)$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
Calculate the momentum and de-Broglie wave length of the electrons acceleration through a potential difference of $56\; v.$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
Light of wave length 488 nm is produced by an argon laser which is used in the photo electric effect . When light from this spectral line is incident on the cathode , the stopping potential of photo electrons is $0.30\;ev$ . Find the work function of the material from which the cathode is made. given $(h= 6.63 \times 10^{-34}\;Js, lev =1.6 \times 10^{-19}\;J)$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
Light of wave length 488 nm is produced by an argon laser which is used in the photo electric effect . When light from this spectral line is incident on the cathode , the stopping potential of photo electrons is $0.30\;ev$ . Find the work function of the material from which the cathode is made.given $(h= 6.63 \times 10^{-34}\;Js, me= 9 \times 10^{-31}kg, \; lev =1.6 \times 10^{-19}\;J)$
cbse
class12
physics
ch11
sec-a
ncert
easy
asked
Jun 23, 2016
by
meena.p
1
answer
Which of the following statements regarding aluminium is not correct ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
medium
q40
asked
Jul 28, 2014
by
thanvigandhi_1
1
answer
The number of water of crystallization in Borax is
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q64
asked
Jul 27, 2014
by
thanvigandhi_1
1
answer
In Borax, the number of -OH group attached to boron atoms is
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q63
asked
Jul 27, 2014
by
thanvigandhi_1
1
answer
In the reaction $H_3BO_3$$ _{\overrightarrow{375k}} A$$ _{\overrightarrow{475k}} B$$ _{\overrightarrow{red\: heat}} C$ The compounds A, B and C respectively are
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
medium
q62
asked
Jul 27, 2014
by
thanvigandhi_1
1
answer
Borax has the molecular formula
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q61
asked
Jul 27, 2014
by
thanvigandhi_1
1
answer
Which of the following statement is correct ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q60
asked
Jul 27, 2014
by
thanvigandhi_1
1
answer
Which of the following statement is not correct ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q59
asked
Jul 27, 2014
by
thanvigandhi_1
1
answer
Which of the following statement is incorrect ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q58
asked
Jul 27, 2014
by
thanvigandhi_1
1
answer
Heating of diborane with excess of ammonia to a high temperature yields
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q57
asked
Jul 27, 2014
by
thanvigandhi_1
1
answer
Chrome alum is
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q56
asked
Jul 26, 2014
by
thanvigandhi_1
1
answer
Heating of $Al_2(SO_4)_3$ gives
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
medium
q55
asked
Jul 26, 2014
by
thanvigandhi_1
1
answer
Which of the following alloys does not contain aluminium ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q47
asked
Jul 26, 2014
by
thanvigandhi_1
1
answer
Which of the following statements regarding the structure aluminium chloride is correct ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
medium
q46
asked
Jul 25, 2014
by
thanvigandhi_1
1
answer
The chief ore for the extraction of aluminium is
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q43
asked
Jul 25, 2014
by
thanvigandhi_1
1
answer
Which of the following minerals does not contain aluminium ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q37
asked
Jul 25, 2014
by
thanvigandhi_1
1
answer
Which of the following is metaboric acid ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q30
asked
Jul 25, 2014
by
thanvigandhi_1
1
answer
Which of the following is boric acid ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q29
asked
Jul 25, 2014
by
thanvigandhi_1
1
answer
Which of the following statements regarding Boron is not correct ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
medium
q28
asked
Jul 25, 2014
by
thanvigandhi_1
1
answer
Which of the following statements regarding boron is not correct ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q27
asked
Jul 25, 2014
by
thanvigandhi_1
1
answer
The treatment of $Mg_3B_2$ with acids produces
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
easy
q20
asked
Jul 25, 2014
by
thanvigandhi_1
1
answer
Which of the following facts regarding boron and silicon is not true ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
medium
q13
asked
Jul 25, 2014
by
thanvigandhi_1
1
answer
Which of the following equations is not correctly formulated ?
jeemain
chemistry
inorganic-chemistry
class11
ch11
p-block-elements
group-13
boron-family
medium
q11
asked
Jul 25, 2014
by
thanvigandhi_1
1
answer
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