AIPMT 2012 Prelims | Dual Nature of Radiation and Matter Question 41 | Physics

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

AIPMT 2011 Prelims

MCQ (Single Correct Answer)

-1

Out of Syllabus

In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by

increasing the potential difference between the anode and filament

increasing the filament current

decreasing the filament current

decreasing the potential difference between the anode and flament

AIPMT 2011 Prelims

MCQ (Single Correct Answer)

-1

Photoelectric emission occurs only when the incident light has more than a certain minimum

power

wavelength

intensity

frequency

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