Stopping Potential

Q. In a photo electric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is

1. 1.8 V
2. 1.3 V
3. 0.5 V
4. 2.3 V

Q.

In a photo electric experiment 4 electrons with varying kinetic energy come out.

$E_1=1.6\times {10}^{-19}J{E}_2=2.1\times {10}^{-19}J{E}_3=3.2\times {10}^{-19}J{E}_4=1.2\times {10}^{-19}J$

The stopping potential , given this data will be Volt

Q.

In Photoelectric setup as soon as the potential reaches $V_o$ (stopping potential), the electrons stop coming out of the emitter plate.

1. True

2. False

Q.

According to the classical wave picture of light, how would the current versus potential (between the plates) graph vary upon varying intensity?

1. 

2. 

3. 

4. 

Q. The linear momentum of an electron, initially at rest, accelerated through a potential difference of 100 V is (in kg $m{s}^{-1}$)

1. $2.25\times {10}^7$
2. $5.4\times {10}^7$
3. $2.85\times {10}^{-24}$
4. $5.4\times {10}^{-24}$

Q.

In the Photoelectric setup, I would like to achieve stopping potential by making one of the plates in the setup, positively charged. Which one should I charge positively?

1. More data is required to make a selection

2. The collector plate

3. The emitter plate

4. Stopping potential cannot be achieved by making any plate positively charged

Q. Will making the collector plate positive affect the saturation current?

1. No
2. Yes

Q. When radiation is incident on a photo electron emitter, the stopping potential is found to be 9 V. If $\left(\frac{e}{m}\right)$ for the electron is $1.8\times {10}^{11}ck{g}^{-1}$, the maximum velocity of the ejected electron is

1. $1.8\times {10}^{6}m{s}^{-1}$
   
2. $0.8\times {10}^{3}m{s}^{-1}$
   
3. $6\times {10}^{5}m{s}^{-1}$
   
4. $8\times {10}^{5}m{s}^{-1}$
   

Q.

When stopping potential is applied in an experiment on photoelectric effect, no photocurrent is observed. This means that

1. The photoelectrons are accumulated near the collector plate

2. The photoelectrons are dispersed from the sides of the apparatus.

3. The emission of photoelectrons is stopped

4. The photoelectrons are emitted but are re-absorbed by the emitter metal

Q. Assuming photoemission to take place, the factor by which the maximum velocity of the emitted photoelectrons changes when the wavelength of the incident radiation is increased four times, is

1. 2
2. 4
3. $\frac{1}{4}$
4. $\frac{1}{2}$