Cengage JEE Mains Physics by B.M Sharma

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. 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. 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. 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 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 [...]

Monochromatic light incident on a metal surface emits electrons with kinetic energies from zero to 2.6 eV. What is the least energy of the incident photon if the tightly bound electron needs 4.2eV to remove? The work function of metal is W and λ is the wavelength of the incident radiation. There is no emission [...]

In the experiment on photoelectric effect, the graph between EK(max) and v is found to be a straight line as shown in fig. The threshold frequency and Planck’s constant according to this graph are In the experiment on photoelectric effect the graph between EK(max) and v is found to be a straight line as shown [...]

If a surface has work function of 3.00 eV, the longest wavelength of light which will cause the emission of electrons is. If a surface has work function of 3.00 eV the longest wavelength of light which will cause the emission of electrons is June 4, 2021 Category: Cengage JEE Mains Physics by B.M Sharma [...]

The work function of metal is W and λ is the wavelength of the incident radiation. There is no emission of photoelectrons when The work function of metal is W and λ is the wavelength of the incident radiation. There is no emission of photoelectrons when June 4, 2021 Category: Cengage JEE Mains Physics by [...]

If the intensity of radiation incident on a photocell be increased four times, then the number of photoelectrons and the energy of photoelectrons emitted respectively become. If the intensity of radiation incident on a photocell be increased four times then the number of photoelectrons and the energy of photoelectrons emitted respectively become June 4, 2021 [...]