Question # 1

The existence of positron in 1928 was predicted by

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Anderson

Dirac

Chadwick

Plank

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

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Threshold energy

Threshold frequency

Work function

Work ability

Antiparticle of electron is.

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proton

Photon

Positron

Neutron

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

Einstein photoelectric equation is

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None of these

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

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

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sodium

Copper

Nicked

Cobalt

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

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

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

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

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 existence of positron was discovered in:

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1929

1928

1931

1933

In the equation if f₂ > then

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Application of wave like nature of particle is

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Photodiode

Optical microscope

Electron microscope

Compound microscope

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