Question # 1

The most refined form of matter is:

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Smoke

Light

Ice

Fog

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

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50 V

2 V

5 V

15 V

Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

All motions are

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Absolute

Uniform

Relative

Variable

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

The number of electrons emitted depends upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

The energy of photon is givne by

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mv2/2

hf

Va e

mac¹

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

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Ics Part 2 Physics Chapter 8 Test Online MCQs With Answers

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