Question # 1

The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as

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classical mechanics

Newtonian mechanics

quantum mechanics

statistical mechanics

Electromagnetic radiation or photons interact with matter in

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two distinct ways

three distinct ways

four distinct ways

five distinct ways

Max plank received the Nobel Prize in physics for his discovery of energy quanta in

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1900

1906

1912

1918

The existence of position was predicted by Dirace in

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1920

1925

1930

1928

The Einstein's changes in length, mass and time are not observed in common life because

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We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

Compton was awarded Nobel prize in physics in

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1921

1923

1925

1927

There is no way to detect:

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Absolute uniform motion

Accelerated motion

State rest

State of motion

None of these

Photoelectrons are emitted when ultraviolet light falls on:

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Casium

Silver

Potassium

Any of these

None of these

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

According to the de-Brogile relation, an object of large mass and ordinary speed has

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very small wavelength

very large wavelength

very small frequency

all of these

The special theory of relatively treats the problems involving:

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Inertial frames of reference

Non-inertial frames

Non-accelerated frame

Botha (A) and (C)

Both (B) and (C)

From the theory of relativity, momentum p of the photon is related to energy as

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p = hfc

p = hf/c

p = f(hc,f)

p = cf/h

Electromagnetic -radiation means:

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Photons

protons

Electrons

Mesons

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

Which of the following phenomenon proves the particle nature of light

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interference

diffraction

photoelectric effect

none of these

The inside cavity of the black body is

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painted white

painted silver

blackened with soot

painted red

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