Recent questions tagged class12

The angle between the planes $3x+4y+5z=3$ and $4x-3y+5z=2$ is ?

asked Dec 31, 2013 by rvidyagovindarajan_1

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The angle between the lines $\large\frac{2-x}{1}=\frac{y}{2}=\frac{z+3}{1}\:\:and\:\:\large\frac{x-4}{4}=\frac{y-1}{1}=\frac{z-5}{2}$ is?

asked Dec 31, 2013 by rvidyagovindarajan_1

1 answer

If the planes $x=cy+bz,\:\:y=az+cx,\:z=bx+ay$ pass through a line then $a^2+b^2+c^2+2abc=?$

asked Dec 31, 2013 by rvidyagovindarajan_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

asked Dec 31, 2013 by thanvigandhi_1

1 answer

Integrate : $\int \large\frac{1}{\Large\frac{\sqrt 3}{2} \sin x + \cos x }$$dx$

asked Dec 31, 2013 by meena.p

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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

asked Dec 31, 2013 by thanvigandhi_1

1 answer

Integrate : $\int \large\frac{\sin 4x}{\sqrt {8+\sin ^4 2x}}$$dx$

asked Dec 31, 2013 by meena.p

1 answer

Figure shows the variation of photocurrent with anode potential for a photo-sensitive surface for three different radiations

asked Dec 31, 2013 by thanvigandhi_1

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Integrate: $\int \large\frac{1}{x \sqrt {x\log (x^2) -5}}$$dx$

asked Dec 31, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{1}{4x^2-6x+7}$$dx$

asked Dec 31, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{1}{\sqrt x -\sqrt {x- 8 }}$$dx$

asked Dec 31, 2013 by meena.p

1 answer

Integrate: $\int (2x-7) \sqrt {5x+2} dx$

asked Dec 31, 2013 by meena.p

1 answer

Integrate : $\int \cos ^{-1} \bigg(\large\frac{1-\tan^2 x}{1+\tan^2x}\bigg) $$dx$

asked Dec 31, 2013 by meena.p

1 answer

$f(x) =\int \large\frac{x^6+1}{x^2+1}$$dx+c,$ then find $f(0)-C=?$

asked Dec 31, 2013 by meena.p

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

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:

asked Dec 31, 2013 by thanvigandhi_1

1 answer

Integrate : $\int e^x \large\frac{(x+6)}{(x+7)^2}$$dx$

asked Dec 31, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{1}{(\log_ex)^2+1}$

asked Dec 31, 2013 by meena.p

1 answer

Integrate : $\int x^{\tan x }\bigg[\large\frac{\tan x}{x} $$+ \sec^2 x . \log x \bigg]$$dx$

asked Dec 31, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{3x^2+5}{(x^2+1)(x^2+4)}$

asked Dec 31, 2013 by meena.p

1 answer

In which of the following cases the heavier of the two particles has a smaller de-Broglie wavelength? The two particles

asked Dec 31, 2013 by thanvigandhi_1

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Figure shows the results of an experiment involving photoelectric effect. The graphs A,B,C,D relate to light beams having different wavelengths.

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:

asked Dec 31, 2013 by thanvigandhi_1

1 answer

Integrate : $\int \large\frac{x . \sin x}{1+ \cos x}$$dx$

asked Dec 31, 2013 by meena.p

1 answer

Which of the following statements is not in support of the quantum nature of light?

asked Dec 31, 2013 by thanvigandhi_1

1 answer

The energy that should be added to an electron to reduce its de-Broglie wavelength from 1nm to 0.5 nm is

asked Dec 31, 2013 by thanvigandhi_1

1 answer

Integrate : $\int \limits_0^1 (x^3-x^2-x-1) . \sin x dx$

asked Dec 31, 2013 by meena.p

1 answer

The energy of a photon is equal to the KE of a proton. The energy of the photon is E. Let $ \lambda_1$ be the de- Broglie wavelength of the proton and $ \lambda_2$ be the wavelength of the photon. So, $\large\frac{\lambda_1}{\lambda_2}$ is

asked Dec 31, 2013 by thanvigandhi_1

1 answer

Integrate : $ \int \limits_0^1 x^4.e^x.dx$

asked Dec 31, 2013 by meena.p

1 answer

We wish to see inside an atom. Assuming the atom to have a diameter of 100 pm, this means that one must be able to resolve a width of say 10 pm. If an electron microscope is used, the minimum electron energy required is about

asked Dec 31, 2013 by thanvigandhi_1

1 answer

Which of the following graphs correctly represents the variation of particle momentum with associated de-Broglie wavelength?

asked Dec 31, 2013 by thanvigandhi_1

1 answer

Integrate : $\int \large\frac{3x}{(x+1)(x+2)}$$dx$

asked Dec 31, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{dx}{(x-p) \sqrt {(x-p)} \sqrt {x-q}}$

asked Dec 31, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{\cos x - \sin x}{\sqrt {\sin 2x}}$$dx$

asked Dec 31, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{3}{7} .\frac{2^{\Large \log e^{x^2}}}{x}.$$dx$

asked Dec 31, 2013 by meena.p

1 answer

Integrate : $\int \large\frac{\cos^2 x}{\sin ^4 x }$$dx$

asked Dec 31, 2013 by meena.p

1 answer

S1: If momentum of a body increases by 50%, its KE will increase by 125%. S2: KE is proportional to square of velocity.

asked Dec 30, 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.

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.

asked Dec 30, 2013 by thanvigandhi_1

1 answer

Integrate : $ \int \large\frac{7}{3} \bigg( \frac{1}{x}-\frac{1}{x^2 }\bigg)$$ \times a (\log x + \large\frac{1}{x} ) $$dx$

asked Dec 30, 2013 by meena.p

1 answer

Integrate : $\int e^x \bigg( \sin ^{-1} x +\large\frac{1}{\sqrt {1-x^2}}\bigg) dx $

asked Dec 30, 2013 by meena.p

1 answer

Integrate: $\int -cosec ^2 (\log x ) + \cot (\log x) dx$

asked Dec 30, 2013 by meena.p

1 answer

Integrate : $\int e^x. \bigg[\large\frac{1- \sin x}{1- \cos x }\bigg].$$dx$

asked Dec 30, 2013 by meena.p

1 answer

A radiation of energy $E$ falls normally on a perfectly reflecting surface. The momentum transferred to the surface

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 :

asked Dec 30, 2013 by thanvigandhi_1

1 answer

Which of the given colors do not show photoelectric effect from this experiment?

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

asked Dec 30, 2013 by thanvigandhi_1

1 answer

If position vector of the points $A,B,C,D$ are given by $7\hat i-4\hat j+7\hat k,\:\hat i-6\hat j+10\hat k,\:-\hat i-3\hat j+4\hat k\:\:and\:\:5\hat i-\hat j+5\hat k$ respectively, then $ABCD$ is ?

asked Dec 30, 2013 by rvidyagovindarajan_1

1 answer

The length of median through $A$ of the $\Delta\:ABC$ where $\overrightarrow {AB}=3\hat i+4\hat k\:\:and\:\:\overrightarrow {AC}=5\hat i-2\hat j+4\hat k$ is ?

asked Dec 30, 2013 by rvidyagovindarajan_1

1 answer

Integrate : $\int x.2^x dx$

asked Dec 30, 2013 by meena.p

1 answer

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