EASY
KCET (UG)
IMPORTANT
Earn 100

According to Einstein's photoelectric equation, the graph between kinetic energy of photoelectrons ejected and the frequency of incident radiation is

77.03% studentsanswered this correctly

Important Questions on Dual Nature of Matter and Radiation

MEDIUM
KCET (UG)
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 30 - Dual Nature of Matter and Radiation>KCET (UG) 2020>Q 1
A light beam of intensity 20 W cm-2 is incident normally on a perfectly reflecting surface of sides 25 cm×15 cm. The momentum imparted to the surface by the light per second is
MEDIUM
KCET (UG)
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 30 - Dual Nature of Matter and Radiation>KCET (UG) 2018>Q 2
The number of photons falling per second on a completely darkened plate to produce a force of 6.62×10-5 N is n. If the wavelength of the light falling is 5×10-7 m, then n=…×1022.h=6.62×10-34 J-s
MEDIUM
KCET (UG)
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 30 - Dual Nature of Matter and Radiation>KCET (UG) 2021>Q 3
A proton moving with a momentum P1 has a kinetic energy 18th of its rest mass energy. Another light photon having energy equal to the kinetic energy of the proton possesses a momentum P2. Then the ratio P1-P2P1 is equal to
EASY
KCET (UG)
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 30 - Dual Nature of Matter and Radiation>KCET (UG) 2020>Q 4

The following graph represents the variation of photo current with anode potential for a metal surface. Here I1, I2 and I3 represents intensities and γ1,γ2,γ3 represents frequency for curves 1, 2 and 3 respectively, then

EASY
KCET (UG)
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 30 - Dual Nature of Matter and Radiation>KCET (UG) 2019>Q 5
Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes
EASY
KCET (UG)
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 30 - Dual Nature of Matter and Radiation>KCET (UG) 2018>Q 6
The maximum kinetic energy of emitted photoelectrons depends on
MEDIUM
KCET (UG)
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 30 - Dual Nature of Matter and Radiation>KCET (UG) 2021>Q 7
The work function of a metal is 1eV. Light of wavelength 3000 A∘ is incident on this metal surface. The velocity of emitted photoelectrons will be
EASY
KCET (UG)
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 30 - Dual Nature of Matter and Radiation>KCET (UG) 2020>Q 9
The de-Broglie wavelength associated with electron of hydrogen atom in the ground state is