Consider a 20 W bulb emitting light of wavelength `5000 oversetcircA` and shining on a metal surface kept at a distance 2m . Assume that the metal surface work function of 2eV and that each atom on the metal surface can be treated as a cirular disc of radius 1.5 A.
Estimate no. of photons emitted by the bulb per second.[Assume no other losses]

Consider a 20 W bulb emitting light of wavelength 5000 oversetcircA and shining on a metal surface kept at a distance 2m . Assume that the metal surface work function of 2eV and that each atom on the metal surface can be treated as a cirular disc of radius 1.5 A. will there be photoelectric emission?

Consider a 20 W bulb emitting light of wavelength 5000 oversetcircA and shining on a metal surface kept at a distance 2m . Assume that the metal surface work function of 2eV and that each atom on the metal surface can be treated as a cirular disc of radius 1.5 A. Can you explain how photoelectric effect was observed instantaneously?

Consider a 20 W bulb emitting light of wavelength 5000 oversetcircA and shining on a metal surface kept at a distance 2m . Assume that the metal surface work function of 2eV and that each atom on the metal surface can be treated as a cirular disc of radius 1.5 A. How many photons would atomic disc receive within time duration calculated in (iii) above?

Consider a 20 W bulb emitting light of wavelength 5000 oversetcircA and shining on a metal surface kept at a distance 2m . Assume that the metal surface work function of 2eV and that each atom on the metal surface can be treated as a cirular disc of radius 1.5 A. How much time would be required by the atomic disc to receive enrgy equal to work function.

A radiation of 5000 overset @ A is incident on metal surface whose work- function is 1.2 eV. find out the value of stopping potential.

Radiation of wavelength 5000 oversetcircA and of intensity 2xx10^-3w cm^-2 falls on a photosensitive surface. Assuming that every absorbed photon results in the ejection of photoelectron, find how many photoelectrons are produced per cm^2 per sec.

Work function of a metl surface is 4.2 eV. The maximum wavelength which can eject electrons from this metal surface is:

X-rays of wavelength lambda fall on an phtot senstive surface,emitting electrons.Assuming that the work function of the surface can be netglected,prove that the de-Broglie wavelength of electrons emited will be sqrt(h lambda//(2 m c)) .

A photon of wavelength 4 xx 10 ^(-7) m strickes on metal surface, the work function of the metal being 2.13 eV. Calculate energy of the photon (eV)