Question # 1

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

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sodium

Copper

Nicked

Cobalt

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

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500^oC

900^oC

1100^oC

1300^oC

An electron miroscope emplys which to one of the following particles?

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Electron ahve a wave nature

Electrons can be focused by an electric field

Electrons can be focused by a magnetic field

All of the above

Who explained the photo electric effect.

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Max Plank

Einstein

Henry

Rutherford

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

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

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

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

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

Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

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

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

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Mass

Charge

Energy

Momentum

Max planck received noble prize in:

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1927

1932

1918

1914

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

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

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

Earth orbital speed is.

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10 km/s

20 km/s

30 km/s

40 km/s

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