Saturation Current

Q.

A potential difference created between the two plates in the photoelectric experiment setup helps to accelerate the photoelectrons, so that all of them reach the collector plate and contribute to the current. In the absence of such an accelerating potential, will there be any photocurrent at all? (Assume the photoelectrons come out perpendicular to the emitter plate.)

1. Yes, but only if the intensity of light is extremely high

2. Yes, but only if the frequency of light v is extremely high

3. Yes, as long as $hv>\varphi$

4. No, there needs to be a pull from the collector plate for current to exist, just like any battery driven circuit

Q. When monochromatic light falls on a photosensitive material, the number of photoelectrons emitted per second is $n$ and their maximum kinetic energy is $K_{max}$. If the intensity of the incident light is doubled, then

1. Both $n$ and $K_{max}$ are doubled.
   
2. Both $n$ and $K_{max}$ are halved.
   
3. $n$ is doubled but $K_{max}$ remains the same.
   
4. $K_{max}$ is doubled but $n$ remains the same.
   

Q.

Alright. We have understood that there will be some photocurrent even when the potential maintained between the plates is zero. But is saturation current achieved at V = 0?

1. Yes, but only if the intensity is high and a lot of electrons are getting ejected.

2. Yes, always

3. No, never

Q.

Ram and Satra are performing photo electric effect in the lab.

The number of electrons coming out from the emitter plate is same for both of them but in Ram's setup the electrons come out with velocity V while in Satra's setup they come out with 2V. Who will record a higher Photo current?

1. Ram

2. Satra

3. Both with have same current

4. Data insufficient

Q. To increase the current in a photocell significantly,

1. energy of incident radiation is increased.
2. frequency of incident radiation is increased.
3. wavelength of incident radiation is increased.
4. the cell is filled with a suitable inert gas eg. Helium, Neon etc.

Q. An electric lamp and a candle produce equal illuminance at a photometer screen when they are placed at 80 cm and 20 cm from the screen respectively. The lamp is now covered with a thin paper which transmits 49% of the luminous flux. By what distance should the lamp be moved to balance the intensities at the screen again?