EASY
12th West Bengal Board
IMPORTANT
Earn 100

Discuss the construction and working principle of a photoelectric cell. Mention some of its uses.

Important Questions on Photoelectric Emission and Production and Properties of X-Rays

EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 19 - Photoelectric Emission and Production and Properties of X-Rays>EXERCISE 19>Q 13
State briefly the properties of photons.
HARD
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 19 - Photoelectric Emission and Production and Properties of X-Rays>EXERCISE 19>Q 15
Explain why there is a cut-off frequency of the X-rays from a particular X -ray tube. Also explain why it should be regarded as a quantum phenomenon.
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 19 - Photoelectric Emission and Production and Properties of X-Rays>EXERCISE 19>Q 1
An ultraviolet light has wavelength of 3×10-5 cm. What will be the energy of the associated photons in electron volt ?c=3×1010 cm/s
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 19 - Photoelectric Emission and Production and Properties of X-Rays>EXERCISE 19>Q 3
Light from a source is incident on sodium and emits photoelectrons with maximum kinetic energy 0.73eV. If the work function of sodium is 1.82eV, what is the energy of the incident photon in eV? Find the wavelength of the incident light.
[Given: h=6.63×10-27erg-s,c=3×1010 cm/s,2eV=1.6×10-12erg]
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 19 - Photoelectric Emission and Production and Properties of X-Rays>EXERCISE 19>Q 4
The maximum KE. of photoelectrons emitted from a metal due to incidence of light of wavelength 5000A→ is 0.3eV. Find out the work function of the metal in eV (given h=6.64x10-2erg-s,1eV=1.6×10-12erg
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 19 - Photoelectric Emission and Production and Properties of X-Rays>EXERCISE 19>Q 5
The work function of zinc is 3.6eV. The threshold frequency for zinc is 9×1014 Hz. Calculate Planck's constant 1eV=1.6×10-12 erg 
EASY
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 19 - Photoelectric Emission and Production and Properties of X-Rays>EXERCISE 19>Q 6
The photoelectric threshold wavelength for a certain metal is 2640A→. What will be the maximum kinetic energy of photoelectrons emitted from the metal if ultraviolet light of wavelength 1810A→ is incident on it? Planck's constant =6.2×10-34Js speed of light is vacuum =3×105 m/s
MEDIUM
12th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART 2 : CLASS 12>Chapter 19 - Photoelectric Emission and Production and Properties of X-Rays>EXERCISE 19>Q 7
The threshold wavelength of tungsten is 2400 A∘. When tungsten is illuminated with light of wavelength 1600 A∘,Find stopping potential.