AIPMT 2012 Prelims | Dual Nature of Radiation and Matter Question 42 | Physics

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 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 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

Previous Next

NEET Subjects

Biology

Zoology

Human Health and Diseases Body Fluids and Its Circulation Locomotion and Movement Neural Control and Coordination Reproduction in Organisms Reproductive Health Structural Organisation in Animals Digestion and Absorption Excretory Products and Their Elimination Chemical Coordination and Integration Human Reproduction Animal Kingdom Breathing and Exchange of Gases Evolution