AIPMT 2012 Prelims | Dual Nature of Radiation and Matter Question 39 | Physics

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the material is

4 $$ \times $$ 10¹⁵ Hz

5 $$ \times $$ 10¹⁵ Hz

1.6 $$ \times $$ 10¹⁵ Hz

2.5 $$ \times $$ 10¹⁵ Hz

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

A 200 W sodium street lamp emits yellow light of wavelength 0.6 $$\mu $$m. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is

1.5 $$ \times $$ 10²⁰

6 $$ \times $$ 10¹⁸

62 $$ \times $$ 10²⁰

3 $$ \times $$ 10¹⁹

AIPMT 2012 Prelims

MCQ (Single Correct Answer)

-1

An $$\alpha $$-particle moves in a circular path of radius 0.83 cm in the presence of a magnetic field of 0.25 Wb/m². The de Broglie wavelength associated with the particle will be

1 $$\mathop A\limits^ \circ $$

0.1 $$\mathop A\limits^ \circ $$

10 $$\mathop A\limits^ \circ $$

0.01 $$\mathop A\limits^ \circ $$

AIPMT 2011 Mains

MCQ (Single Correct Answer)

-1

The threshold frequency for a photosensitive metal is 3.3 $$ \times $$ 10¹⁴ Hz. If light of frequency 8.2 $$ \times $$ 10¹⁴ Hz is incident on this metal, the cut- off voltage for the photoelectron emission is nearly

1 V

2 V

3 V

5 V

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