Question # 1

De-Broglie waves are associated with

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Moving charged particles only

Moving neutral particles only

All moving particles

All parties whether in motion or at rest

The maximum kinetic energy of emitted photo electrons depends upon.

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The intensity of incident light

Frequency of the incident light

Metal surface

Both frequency of incident light and metal surface.

When platinum wire is heated, it changes to cherry red at temperature.

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500^oC

900^oC

1100^oC

1300^oC

The energy of photon is givne by

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mv2/2

hf

Va e

mac¹

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 dimensions of Plank's constant is same as that of.

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Energy

Power

Acceleration

Angular momentum

Disintegration of photon on striking a nucleus into an electron and positron is known as.

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Annihilation of matter

Compton effect

Pair production

Photo electric effect

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2

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

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Length

Time

Mass

Energy

Albert Einstein got noble prize in:

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1926

1921

1918

1931

The materialization of energy take place in the process of.

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Photo electric effect

Compton Effect

Pair production

Annihilationof matter

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

Platinum wire becomes yellow at a temperature of.

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900^oC

1300^oC

1600^oC

500^oC

In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of.

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90^oC

Zero

120^oC

45^oC

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

The existence of positron in 1928 was predicted by

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Anderson

Dirac

Chadwick

Plank

In 1905, the special theory of relativity was proposed by

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Einstein

Bohr

Maxwell

De Broglie

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

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