AIPMT 2010 Prelims | Dual Nature of Radiation and Matter Question 46 | Physics

AIPMT 2010 Prelims

MCQ (Single Correct Answer)

-1

A beam of cathode rays is subjected to crossed electric (E) and magnetic fields (B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by

(Where V is the potential difference between cathode and anode)

$${{{B^2}} \over {2V{E^2}}}$$

$${{2V{B^2}} \over {{E^2}}}$$

$${{2V{E^2}} \over {{B^2}}}$$

$${{{E^2}} \over {2V{B^2}}}$$

AIPMT 2010 Prelims

MCQ (Single Correct Answer)

-1

The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work functions 5.01 eV, when ultraviolet light of 200 nm falls on it, must be

2.4 V

$$-$$ 1.2 V

$$-$$ 2.4 V

1.2 V

AIPMT 2010 Prelims

MCQ (Single Correct Answer)

-1

A source S₁ is producing, 10¹⁵ photons per second of wavelength 5000 $$\mathop A\limits^ \circ $$. Another source S₂ is producing 1.02 $$ \times $$ 10¹⁵ photons per second of wavelength 5100 $$\mathop A\limits^ \circ $$. Then, (power of S₂)/(power of S₁) is equal to

1.00

1.02

1.04

0.98

AIPMT 2009

MCQ (Single Correct Answer)

-1

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

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

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