Question # 1

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

Which is the most refined form of matter.

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Smoke

Fog

Light

Electron

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

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

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

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

In 1905, the special theory of relativity was proposed by

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Einstein

Bohr

Maxwell

De Broglie

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

unit of Plank's constant is same as that of.

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Acceleration

Angular momentum

Linear momentum

Entropy

The position has charge which is in magnitude equal to the charge on

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Electron

Proton

β particle

All

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

In the equation if f₂ > then

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Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

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