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Zener Diode as Voltage Stabilizer

It is found t...

Question

It is found that ammeter current remains unchanged $(2 μ A)$ even when the jockey is moved from the end P to the middle point of the potentiometer wire. Assuming that all the incident photons eject electrons and the power of the light incident is $4 \times 10^{- 6} W$ . Then, the color of the incident light is

A

green

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B

violet

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C

red

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D

orange

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Solution

The correct option is D orange

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Q. An experimental setup for verification of photoelectric effect is shown in the diagram. The voltage across the electrodes is measured with the help of an ideal voltmeter, and it can be varied by moving jockey

J

on the potentiometer wire. The battery used in potentiometric circuit is of

20 V

and its internal resistance is

2 Ω

. The resistance of

100 cm

long potentiometer wire is

8 Ω

The photo current is measured with the help of an ideal ammeter.

The wavelength of various colours is as follows:

Violet : 4000 ˚ A - 5000 ˚ A

Blue : 4500 ˚ A - 5000 ˚ A

Green : 5000 ˚ A - 5500 ˚ A

Yellow : 5500 ˚ A - 6000 ˚ A

Orange : 6000 ˚ A - 6500 ˚ A

Red : 6500 ˚ A - 7000 ˚ A

It is found that the ammeter current remains unchanged

(2 μ A)

even when the jockey is moved from the end

P

to the middle point of the potentiometer wire. Assuming one photon ejects one electron and the power of the light incident is

4 \times 10^{- 6} W

, the colour of the incident light is:

Q. When other light falls on the anode plate, 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

3.0 m W

400 n m

light is incident on a photoelectric cell, if

0.1 %

of the photons are contributing in ejection of electrons, then the current in the cell is

Q. Choose the correct answer from the alternatives given.
A parallel beam of monochromatic radiation of cross-section area A

(< π a^{2})

, intensity I and frequency

υ

is incident on a solid conducting sphere of work function

ϕ_{o} (h v > ϕ_{0})

and radius a. The sphere is grounded by a conducting wire. Assume that for each incident photon, one photoelectron is ejected. Just after this radiation is incident on initially unchanged sphere the current through the conducting wire is

Q. When radiation falls on the cathode plate, a current of

2 μ A

is recorded in the ammeter. Assuming that the vacuum tube setup follows Ohm/s law, the equivalent resistance of vacuum tube operating in this case when jockey is at end P is

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