Question # 1

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

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

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Threshold energy

Threshold frequency

Work function

Work ability

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

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

The materialization of energy take place in the process of.

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Photo electric effect

Compton Effect

Pair production

Annihilationof matter

Albert Einstein got noble prize in:

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1926

1921

1918

1931

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

Einstein photoelectric equation is

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None of these

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 uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

Energy of Black body radiation depends upon

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Nature of surface of body

Nature of material of body

Shape and size of body

Temperature of the body

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

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

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Energy

Speed

Frequency

Wavelength

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

Which one of the following paved the way for modern physics

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Newtonian mechanics

Theory of relativity

Quantum theory

All of above

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

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sodium

Copper

Nicked

Cobalt

Compton's effect is associated with

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gamma rays

Beta rays

X rays

Positive rays

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