Question # 1

The mass of an object will be doubled at speed.

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2.6 x 10⁸ m/s

1.6 x 10⁸m/s

2.6 x 10⁷m/s

3.6 x 10⁷ m/s

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

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

The most refined form of matter is:

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Smoke

Light

Ice

Fog

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

The principle regarding the dual nature of light was first discovered by

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Compton

J.J.Thomson

De-Broglie

Heisenberg

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

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Length

Time

Mass

Energy

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

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Energy

Power

Acceleration

Angular momentum

If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

Anti particle of electron is

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Proton

Photon

Neutron

Positron

The existence of positron was discovered in:

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1929

1928

1931

1933

1 kg mass will be equivalent to energy.

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9 x 10⁸ J

9 X 10¹² J

9 X 10¹⁶ J

9 X 10¹⁹ J

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

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Threshold energy

Threshold frequency

Work function

Work ability

The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

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

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sodium

Copper

Nicked

Cobalt

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

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