Stopping Potential vs Frequency

Q. Photon A has twice the energy of photon B. Then which option is correct?

1. Momentum of A is less than momentum of B.
2. Wavelength of A is greater than wavelength of B.
3. Wavelength of A is less than wavelength of B.
4. Wavelength of A is equal to wavelength of B.

Q. Photoelectric current depends on the frequency of the incident light.

1. True
2. False

Q. When a certain metallic surface is illuminated with mono-chromatic light of wave length $\lambda$, the stopping potential for photo electric current is $6V_0$. When the same surface is illuminated with light of wave length $2\lambda$, the stopping potential is $2V_0$. The threshold wavelength of this surface for photoelectric effect is :

1. $6\lambda$
2. $4\lambda /3$
3. $4\lambda$
4. $8\lambda$

Q. Wave theory predicts that the stopping potential for a conductor in photoelectric effect remains constant on increasing frequency of light.

1. True
2. False

Q. A beam of plane polarized light falls normally on a polarizer (cross-sectional area $3\times {10}^{-4}{\text{m}}^2$) which rotates about the axis of the ray with an angular velocity of $31.4\text{rad/s}$. Find the energy of light $E$ passing through the polarizer per revolution and the intensity $I_{avg}$ of the emergent beam if the flux of energy of the incident ray is ${10}^{-3}\text{W}$.

1. $E={10}^{-3}\text{J},I_{avg}=1.97{\text{W/m}}^2$
2. $E={10}^{-4}\text{J},I_{avg}=1.67{\text{W/m}}^2$
3. $E={10}^{-3}\text{J},I_{avg}=1.67{\text{W/m}}^2$
4. $E={10}^{-4}\text{J},I_{avg}=1.97{\text{W/m}}^2$