Question # 1

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

The maximum energy of the photoelectrons can be determined by making the:

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Anode positive

Anode negative

Cathode positive

Both (b) & (c)

In a photocell, cesium coated oxidized silver emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of the incident light

Temperature of the surface

All of above

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

The energy of photon of wavelength 1240 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

The unit of work function is

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eV

Volt

Farad

Herdz

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

Which of the particles, electron, proton and neutron moving with same speed has longest wave length?

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Electron

Proton

Neutron

All have same

The dimensions of Planck’s constant “h” are same as that of:

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Momentum

Angular momentum

Work

Torque

J.J Thomson finds:

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Particle nature of the electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

De-Broglie received the Nobel prize in

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1929

1937

1928

1924

Photoelectric effect and Compton effect prove the:

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Wave nature of light

Particle nature of light

Dual nature of light

In a photocell, sodium and potassium emit electrons for:

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Visible light

Infrared light

Ultraviolet light

All of these

The number of electrons emitted depend upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

Rest mass energy of electron is:

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1.02 MeV

0.51 MeV

931 MeV

200 MeV

There is a certain frequency below which no electrons are emitted from the metal surface, this frequency is known as:

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Critical frequency

Threshold frequency

Maximum frequency

Minimum frequency

Davisson and Germer, in their experiment used:

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Nickle crystal

Lead crystal

Graphite crystal

Glass

Compton Effect makes the use of the law of conservation of:

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Energy

Momentum

Charge

Both (a) & (b)

Photo cells are used for :

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Security and counting system

Automatic door system

Automatic street lighting

All of these

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