The Experimental Setup

Q. Ultraviolet light of wavelength $\lambda =200nm$ is used in an experiment on photoelectric effect with cesium ($\varphi =1.8$). Find De-Broglie wavelength of photo electron with maximum kinetic energy.

1. $\frac{4}{7}\times {10}^{-9}m$
2. 
   $\frac{28}{5}\times {10}^{-9}m$
3. $\frac{19}{7}\times {10}^{-9}m$
4. $\frac{2}{7}\times {10}^{-9}m$

Q. Graph between maximum kinetic energy of electron and frequency of incident photon in photoelectric effect is shown. The slope of the curve is

1. Charge of an electron
2. Work function of metal
3. Planck’s constant
4. Ratio of Planck’s constant and charge of electron

Q.

Photo cell is a device to

1. Store photons

2. Measure light intensity

3. Convert photon energy into mechanical energy

4. Store electrical energy for replacing storage batteries

Q.

The photoelectric effect can be understood on the basis of

1. The principle of superposition

2. The electromagnetic theory of light

3. The special theory of relativity

4. Line spectrum of the atom

Q. Energy conversion in a photoelectric cell takes place from

1. Chemical to electrical
2. Magnetic to electrical
3. Optical to electrical
4. Mechanical to electrical

Q. Graph between maximum kinetic energy of electron and frequency of incident photon in photoelectric effect is shown. The slope of the curve is

1. Charge of an electron
2. Work function of metal
3. Planck’s constant
4. Ratio of Planck’s constant and charge of electron

Q.

The intensity of light $I_1$ received by the emitter plate in Lenard's photoelectric set-up is changed by moving the source to twice the initial distance. What is the new intensity $I_2$ received by the emitter plate?

1. $I_2=I_1$

2. $I_2=0.25I_1$

3. $I_2=0.5I_1$

4. $I_2=2I_1$

Q.

The intensity of light $I_1$ received by the emitter plate in Lenard's photoelectric set-up is changed by moving the source to twice the initial distance. What is the new intensity $I_2$ received by the emitter plate?

1. $I_2=I_1$

2. $I_2=0.25I_1$

3. $I_2=0.5I_1$

4. $I_2=2I_1$