Question # 1

When a platinum wire is heated, it appears white at

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1600°C

900°C

1100°C

1300°C

The special theory of relativity is based on:

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Four postulates

Three postulates

Two postulates

One postulate

None of these

Newton's law of motion do not hold in

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an accelerated frame of reference

an unaccelerated frame of reference

both of these

none of these

Compton studied the scattering of x-rays by loosely bound electrons from:

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NaCl crystal

Graphite crystal

Zirconia

Copper crystal

None of these

According to the Max plank, energy is redialed or absorbed in

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discrete packets

continuous waves

either of them

none of these

Which of the following is not an example of intertial frame

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a body placed on the surface of earth

a body placed in a car moving with uniform velocity

a body placed in a car moving with same acceleration

none of these

When a platinum wire is heated, it appears orange red at

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500°C

900°C

1100°C

1300°C

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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100 ev

10⁶e v

10³e v

1.0 e v

In process of annihilation of matter, the two photons produced move in opposite direction to converse

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momentum

charge

energy

mass

Position and momentum of a particle cannot both be measured simultaneously with perfect accuracy. This is the statement of

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photoelectric effect

pair production

Compton effect

uncertainty principle

When platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

The Stephen-Boltzmann law for the black body radiation is given by

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E = T²

E = -T²

E = T⁴

E = -T⁴

An inertial frame is that frame in which

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a>0

a=0

a<0

none of these

de-Broglies hypthesis was experimentally verified by

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Maxwell

Compton

Einstein

Davison and Germer

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

Davision and Germer performed experiment to verify

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de-Brogile hypothesis

theory of relativity

Newton's law of gravitation

Mass-energy relation

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