Question # 1

The value of Stefan is constant is:

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4.57 x 10^-8 m²k²

5.67 x10^-8 wm^-2k^-4

6.67x 10^-11 wm²k⁴

7.45 x 10^-9 m² wk³

The existence of positron was discovered in:

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1929

1928

1931

1933

Who explained the photo electric effect.

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Max Plank

Einstein

Henry

Rutherford

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

The physical quantity related to photon, that does not change in Compton scattering is.

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Energy

Speed

Frequency

Wavelength

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

In 1905, the special theory of relativity was proposed by

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Einstein

Bohr

Maxwell

De Broglie

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

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

The position has charge which is in magnitude equal to the charge on

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Electron

Proton

β particle

All

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 is the most refined form of matter.

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Smoke

Fog

Light

Electron

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

The Compton effect is associated with

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X-rays

y-rays

Positive rays

ß-rays

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

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Compton

J.J.Thomson

De-Broglie

Heisenberg

The energy of the photon of wavelength 500 nm is.

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3.10 eV

2.49 eV

1.77 eV

1.52 eV

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

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