AIPMT 2009 | Dual Nature of Radiation and Matter Question 58 | Physics

The number of photo electrons emitted for light of a frequency $$\upsilon $$ (higher than the threshold frequency $${\upsilon _0}$$) is proportional to

threshold frequency $$\left( {{\upsilon _0}} \right)$$

intensity of light

frequency of light $$\left( {{\upsilon _0}} \right)$$

$$\upsilon - {\upsilon _0}$$

AIPMT 2008

MCQ (Single Correct Answer)

-1

In the phenomenon of electric discharge through gases at low pressure, the coloured glow in the tube appears as a result of

collisions between the charged particles emitted from the cathode and the atoms of the gas

collision between different electrons of the atoms of the gas

excitation of electrons in the atoms

collision between the atoms of the gas

AIPMT 2008

MCQ (Single Correct Answer)

-1

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3 $$ \times $$ 10⁶ m s^$$-$$1. The velocity of the particle is

3 $$ \times $$ 10^$$-$$31 ms^$$-$$1

$$2.7 \times {10^{ - 21}}\,m{s^{ - 1}}$$

2.7 $$ \times $$ 10^$$-$$18 ms^$$-$$1

9 $$ \times $$ 10^$$-$$2 ms^$$-$$1

AIPMT 2008

MCQ (Single Correct Answer)

-1

The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the

infrared region

X-ray region

Ultraviolet region

Visible region

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