The threshold wavelength of a metal is (` lambda_0). Light of wavelength slightly less than lambda_0 is incident on an insulated plate made of this metal. It is found that photoelectrons are emitted for sometimes and after that the emission stops. Explain.

Light of wavelength 200 nm incident on a metal surface of threshold wavelength 400 nm kinetic energy of fastest photoelectron will be

White light consisting of wavelengths 380 nm le lambda le 750 nm is incident on a lead surface. For which one of the following ranges of wavelength will photoelectrons be emitted from the lead surface that has a work function W_(0) = 6.63 xx 10^(-29) J ?

Threshold wavelength for lithium metal is 6250 Å wavelength of incident radiation required for photoelectric emission will be……

When light of wavelength lambda is incident on a metal surface, stopping potential is found to be x. When light of wavelength nlambda is incident on the same metal surface, stopping potential is found to be (x)/(n+1) . Find the threshold wavelength of the metal.

Four photon of lambda gt lambda_(0) are incident on metal surface ……..photo -electron will be emitted.

Work function of metal is phi wavelength of incident light is lambda .Which condition should be followed for not emitting the photo-electron?

In Young's double slit experiment the separation d between the slits is lambda mm, the wavelength of the light used is 5896 Å and distance D between the screen and slits is 100 cm. It is found that the angular width of the fringes is 0.20^(@) . To increase the fringe angular width to 0.21^(@) (with same lambda . and D) the separation between the slits needs to change to .....

When photon of wavelength lambda_(1) are incident on an isolated shere supended by an insulated , the corresponding stopping potential is found to be V . When photon of wavelength lambda_(2) are used , the orresponding stopping potential was thrice the above value. If light of wavelength lambda_(3) is used , carculate the stopping potential for this case.

In a photoelectric effect set up, a point source of light of power 3.2 xx10^(-3) W emits monochromatic photons of energy 5eV .The source is located at a distance of a stationary metallic sphere of work function 3eV and radius 8xx10^(-3)m .The efficiency of photoelectron emission is one for every 10^(6) incident photons.Assume that the sphere is isolated and initially neutral and the photoelectrons are initially swept away after emission. Find the number of photons emitted per second

A photoelectric surface is illuminated successively by monochromatic light of wavelength lambda and (lambda)/(2) .If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times in the first case,the work function of the surface of the material is: (h=Plank's constant ,c=speed of light)