Question # 1

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

The minimum frequency needed to emit an electron form metal surface is called:

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Work function

Threshold frequency

Quanta frequency

All of above

In 1905, the special theory of relativity was proposed by

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Einstein

Bohr

Maxwell

De Broglie

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

Albert Einstein got noble prize in:

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1926

1921

1918

1931

The unit of Plank's constant 'h' is.

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JC

J/C

JS

J/S

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

In an nihilation emitted photons moves in opposite directions to conserve.

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Mass

Charge

Energy

Momentum

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

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

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

Maximum Compton shift is observed at.

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30^oC

90^oC

45^oC

180^oC

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

When the K.E. of photoelectric is zero, the frequency of incident photon is.

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Less than

greater than

Equal to

Much greater

The energy of photon is givne by

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mv2/2

hf

Va e

mac¹

The quantity/factor h/m_oc has the dimensions of.

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Length

Time

Mass

Energy

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Physics FSC Part 2 Chapter 19 Online MCQ's Test MCQs With Answers

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