Question # 1

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

Wave nature of particle was proposed by

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Einstein

Plank

De-Brogile

Max well

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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1.66 x 10^-29m

1.74 x 10^-10cm

17.4 x 10^-6m

1.74 x 10^-10m

Photocell is a device which converts

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chemical energy into electrical energy

electrical energy into light energy

heat energy into electrical energy

light energy into electrical energy

A non-inertial frame of reference is one, in which

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law of inertial is valid

all laws of physics are the same in all frames

a>0 or a<0

a=0

With the help of 50 K v electron microscope, a resolution of

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0.5 to 1 m to possible

1 m to 10 m is possible

0.5 to 1 nm is possible

1 to 10 nm is possible

Due to relative motion of observer and the frame of reference of events, time always:

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Dilates itself

Contracts itself

Stretches itself

Both (A) and (C)

None of these

When a high energy photon interact with a metal, which of the following effect is most likely to be taken place

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pair production

photoelectric effect

Compton effect

None of these

Albert Einstein got the Nobel prize in physics for his explanation of photoelectric effect in

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1916

1919

1921

1923

When a platinum wire is heated, it appears dull red at about

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500°C

900°C

1100°C

1300°C

The year when A.H. compton was awarded Nobel Prize is:

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1923

1927

1931

1935

None of these

The concept of direction and position are purely

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absolute

relative

absolute or relative

none of these

The energy of the 4th orbit in hydrogen atom is

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2.5 ev

- 3.5 ev

-0.85 ev

-13.6 ev

When a platinum wire is heated, it appears white at

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1600°C

900°C

1100°C

1300°C

The unit of work function is:

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Joule

Electron volt

That of threshold frequency

Both (A) and (B)

None of these

Electromagnetic -radiation means:

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Photons

protons

Electrons

Mesons

None of these

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