Question # 1

By modern system of NAVSTAR, the speed any where on the earth can be determined to accuracy about.

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20 ms-1

10 ms-1

2 cms-1

2 ms-1

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

Einstein was awarded Nobel prize in physics in

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1905

1911

1918

1921

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

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

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sodium

Copper

Nicked

Cobalt

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

The quantity/factor h/m_oc has the dimensions of.

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Length

Time

Mass

Energy

Eintein's Photoelectric equation is E_k= hf -∅ in this equation E₁, refers to:

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K.E of al the emited electrons

Mean K.E of emited electrons

Maximum K.E of emited electrons

Minimum K.E of emited electrons

The most refined form of matter is:

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Smoke

Light

Ice

Fog

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

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

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

Number of electros emitted in photo electric effect depend upon.

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Intensity of incident light

Frequency of incident light

Energy of incident light

Wavelength of incident of light

Pair production cannto take place in vacuum because :

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Mass in not conserved

Momentum is not conserved

Energy is not conserved

Charge is not conserved

Platinum wire becomes white at a temperature of.

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1600^oC

1300^oC

1100^oC

900^oC

The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

The energy of photon is givne by

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mv2/2

hf

Va e

mac¹

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

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