Bureau's Higher Secondary Physics Class 12>Chapter 16 - Atomic Physics>MODEL QUESTIONS>Q 18

HARD

12th Odisha Board

IMPORTANT

Earn 100

The work function of tungsten and sodium are $4.4 eV$ and $2.3 eV$ respectively. If the threshold wavelength of sodium is $5460 ° A$ , then the threshold wavelength of tungsten is:

100% studentsanswered this correctly

Important Questions on Atomic Physics

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 16 - Atomic Physics>MODEL QUESTIONS>Q 19

The Light of the frequency of

1.5 times

the threshold frequency is incident on a photosensitive material. If the frequency is halved and the intensity is doubled, the photo current becomes:

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 16 - Atomic Physics>MODEL QUESTIONS>Q 20

A quanta will have more energy if:

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 16 - Atomic Physics>MODEL QUESTIONS>Q 21

The threshold frequency of potassium is

3 \times 10^{14} H z

. The work function is:

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 16 - Atomic Physics>MODEL QUESTIONS>Q 22

Light of wavelength of

4000 ° A

is incident on a metal plate whose work function is

2 eV

. The maximum kinetic energy of the emitted photoelectrons would be:

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 16 - Atomic Physics>MODEL QUESTIONS>Q 23

Matter waves:

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 16 - Atomic Physics>MODEL QUESTIONS>Q 24

If the kinetic energy of a moving particle is

E

, then the de Broglie wavelength is:

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 16 - Atomic Physics>MODEL QUESTIONS>Q 25

The de Broglie wavelength associated with a moving particle of velocity

v

is given by

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 12>Chapter 16 - Atomic Physics>MODEL QUESTIONS>Q 26

Neglecting variation of mass with velocity, the wavelength associated with an electron having kinetic energy

E

is proportional to: