Question # 1

The emission of electrons from metal surface when exposed to light is called:

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Compton effect

Pair production

Photoelectric effect

None of above

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

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Mass

Charge

Energy

Momentum

Who explained the photo electric effect.

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Max Plank

Einstein

Henry

Rutherford

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 unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

Joule second is the unit of.

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Energy

Wein's constant

Planck's constant

Boyle's law

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

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

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

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

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Compton

J.J.Thomson

De-Broglie

Heisenberg

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

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Length

Time

Mass

All of above

The value of Wien's constant:

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2.9x10^-3mk

2.19x10^-7mk

3.18 x10⁶ km^-1

6.21 x 10^-9m²wk³

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

Antiparticle of electron is.

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proton

Photon

Positron

Neutron

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