Question # 1

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

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

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sodium

Copper

Nicked

Cobalt

Anti particle of electron is

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Proton

Photon

Neutron

Positron

In the equation if f₂ > then

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The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

In 1905, the special theory of relativity was proposed by

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Einstein

Bohr

Maxwell

De Broglie

Einstein photoelectric equation is

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None of these

The wavelength associated with the protons moving at speed of 40 m/s is.

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7.20 nm

9.02

15.7 nm

17.3 nm

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

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

The value of Wien's constant:

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2.9x10^-3mk

2.19x10^-7mk

3.18 x10⁶ km^-1

6.21 x 10^-9m²wk³

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

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

When platinum is it becomes orange at

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500^oC

900^oC

1100^oC

1300^oC

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

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