Chapter 28 – Dual Nature of Radiation and Matter
Sahay Sir > Question Answers > Cengage JEE Mains Physics by B.M Sharma > Chapter 28 - Dual Nature of Radiation and Matter
Silver has a work function of 4.7 eV. When ultraviolet light of wavelength 100 mm is incident upon it, a potential of 7.7 V is required to stop the photo electrons from reaching the collector plate. How much potential will be required to stop the photoelectrons when light of wavelength 200 mm is incident upon silver?
04
Jun
Silver has a work function of 4.7 eV. When ultraviolet light of wavelength 100 mm is incident upon it, a potential of 7.7 V is required to stop the photo electrons from reaching the collector plate. How much potential will be required to stop the photoelectrons when light of wavelength 200 mm is incident upon [...]
If a photocell is illuminated with a radiation of 1240 A0, then stopping potential is found to be 8 V. The work function of the emitter and the threshold wavelength are
04
Jun
If a photocell is illuminated with a radiation of 1240 A0, then stopping potential is found to be 8 V. The work function of the emitter and the threshold wavelength are If a photocell is illuminated with a radiation of 1240 A0 then stopping potential is found to be 8 V. The work function of [...]
A material particle with a rest mass mo is moving with a velocity of light c. Then, the wavelength of the de Broglie wave associated with it is
04
Jun
A material particle with a rest mass mo is moving with a velocity of light c. Then, the wavelength of the de Broglie wave associated with it is A material particle with a rest mass mo is moving with a velocity of light c. Then the wavelength of the de Broglie wave associated with it [...]
A modern 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is
04
Jun
A modern 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to be 25% efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is A modern 200 W sodium street lamp emits yellow light of wavelength 0.6 μm. Assuming it to [...]
The work function of a metallic surface is 5.01eV. The photo – electrons are emitted when light of wavelength 2000 Å falls on it . The potential difference applied to stop the fastest photo – electrons is [h=4.14×10^−15 eVsec]
04
Jun
The work function of a metallic surface is 5.01eV. The photo – electrons are emitted when light of wavelength 2000 Å falls on it . The potential difference applied to stop the fastest photo – electrons is [h=4.14×10^−15 eVsec] The work function of metal is W and λ is the wavelength of the incident radiation. [...]
An image of the sun is formed by a lens, of the focal length of 30 cm, on the metal surface of a photoelectric cell and a photoelectric current I is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photoelectric current in this case is
04
Jun
An image of the sun is formed by a lens, of the focal length of 30 cm, on the metal surface of a photoelectric cell and a photoelectric current I is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photoelectric current [...]
A proton when accelerated through a potential difference of V volt has a wavelength λ associated with it. An alpha-particle in order to have the same λ must be accelerated through a potential difference of.
04
Jun
A proton when accelerated through a potential difference of V volt has a wavelength λ associated with it. An alpha-particle in order to have the same λ must be accelerated through a potential difference of. The work function of metal is W and λ is the wavelength of the incident radiation. There is no emission [...]
The frequency of incident light falling on a photosensitive metal plate is doubled, the KE of the emitted photoelectrons is.
04
Jun
The frequency of incident light falling on a photosensitive metal plate is doubled, the KE of the emitted photoelectrons is. The frequency of incident light falling on a photosensitive metal plate is doubled the KE of the emitted photoelectrons is June 4, 2021 Category: Cengage JEE Mains Physics by B.M Sharma , Chapter 28 - [...]
A metal surface is illuminated by a light of given intensity and frequency to cause photoemission. If the intensity of illumination is reduced to one-fourth of its original value, then the maximum KE of emitted photoelectrons will become.
04
Jun
A metal surface is illuminated by a light of given intensity and frequency to cause photoemission. If the intensity of illumination is reduced to one-fourth of its original value, then the maximum KE of emitted photoelectrons will become. A metal surface is illuminated by a light of given intensity and frequency to cause photoemission. If [...]
The work function for sodium surface is 2.0 eV and that for aluminium surface is 4.2 eV. The two metals are illuminated with appropriate radiations so as to cause photoemission. Then
04
Jun
The work function for sodium surface is 2.0 eV and that for aluminium surface is 4.2 eV. The two metals are illuminated with appropriate radiations so as to cause photoemission. Then The work function for sodium surface is 2.0 eV and that for aluminium surface is 4.2 eV. The two metals are illuminated with appropriate [...]