Physics
The photoelectric cut off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons emitted?
07
Jun
The photoelectric cut off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons emitted? The photoelectric cut off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons emitted? June 7, 2021 Category: Chapter 11 - Dual Nature of Radiation and Matter [...]
Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW.
07
Jun
Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. June 7, 2021 Category: Chapter 11 - Dual Nature of Radiation and Matter , NCERT Exemplar Class 12 , [...]
The work function of caesium metal is 2.14 eV. When the light of frequency 6×10^14 Hz is incident on the metal surface, photoemission of electrons occurs. What is the
07
Jun
The work function of caesium metal is 2.14 eV. When the light of frequency 6×10^14 Hz is incident on the metal surface, photoemission of electrons occurs. What is the photoemission of electrons occurs. What is the The work function of caesium metal is 2.14 eV. When the light of frequency 6×10^14 Hz is incident on [...]
Find the (a) maximum frequency and
07
Jun
Find the (a) maximum frequency and Find the (a) maximum frequency and June 7, 2021 Category: Chapter 11 - Dual Nature of Radiation and Matter , NCERT Exemplar Class 12 , Physics ,
A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observe on screen 1 m away. It is observed that the first minimum is at a distance of 2.5mm from the centre of the screen. Find the width of the slit.
20
Nov
A parallel beam of light of wavelength 500 nm falls on a narrow slit and the resulting diffraction pattern is observe on screen 1 m away. It is observed that the first minimum is at a distance of 2.5mm from the centre of the screen. Find the width of the slit. What is the Brewster [...]
Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. What is the longest wavelength of radio waves, which can be sent between the towers without appreciable diffraction effects ?
20
Nov
Two towers on top of two hills are 40 km apart. The line joining them passes 50 m above a hill halfway between the towers. What is the longest wavelength of radio waves, which can be sent between the towers without appreciable diffraction effects ? Two towers on top of two hills are 40 km [...]
In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is 0.1^∘ . What is the spacing between the two slits?
20
Nov
In double-slit experiment using light of wavelength 600 nm, the angular width of a fringe formed on a distant screen is 0.1^∘ . What is the spacing between the two slits? In double-slit experiment using light of wavelength 600 nm the angular width of a fringe formed on a distant screen is 0.1^∘ . What [...]
You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror.
20
Nov
You have learnt in the text how Huygens’ principle leads to the laws of reflection and refraction. Use the same principle to deduce directly that a point object placed in front of a plane mirror produces a virtual image whose distance from the mirror is equal to the object distance from the mirror. and (b) [...]
The 6563 A^0 Hα sign line emitted by hydrogen in a star is found to be red-shifted by 15A^0 . Estimate the speed with which the star is receding from the earth.
20
Nov
The 6563 A^0 Hα sign line emitted by hydrogen in a star is found to be red-shifted by 15A^0 . Estimate the speed with which the star is receding from the earth. The 6563 A^0 Hα sign line emitted by hydrogen in a star is found to be red-shifted by 15A^0 . Estimate the speed [...]
Light of wavelength 5000Å falls on a plane reflecting surface. What are the wavelength and frequency of reflected light ? For what angle of incidence is the reflected ray normal to the incident ray ?
20
Nov
Light of wavelength 5000Å falls on a plane reflecting surface. What are the wavelength and frequency of reflected light ? For what angle of incidence is the reflected ray normal to the incident ray ? Light of wavelength 5000Å falls on a plane reflecting surface. What are the wavelength and frequency of reflected light ? [...]