The photoelectric threshold wavelength for a metal is 10,000 `Å`. When light of wavelength `5461 Å` is incident on it, the retarding potential in Millikan's experiment is 1.02 V. Calculate the value of Planck's constant.

The threshold frequency for a metal is 10^(15) Hz. When light of wavelenght 4000 Å is made incident on it, then

Threshold wavelength for lithium metal is 6250 Å. For photo emission, the wavelength of the incidennt light must be

The threshold wavelength of tungsten is 2300 Å. If ultra voilet light of wavelength 1800 Å is incident on it, then the maximum kinetic energy of photoelectrons would be

For photoelectric emission , tungsten requires light of 2300 Å . If light of 1800 Å wavelength is incident then emission

The threshold wavelength for lithium is 5250 Å. For photoemission to take place, the wavelength of the incident light must be

The threshold wavelength (lambda_(0)) of sodium metal is 6500 Å . If UV light of wavelength 360 Å is used, what will be kinetic energy of the photoelectron in erge?

A photon of wavelength 3310Å falls on a photocathode and an electron of energy 3xx10^(-19)J is ejected. If the wavelength of the incident photon is changed to 5000Å, the energy of the ejected electron is 9.72xx10^(-20)J . Calculate the value of Planck's constant and threhold wavelength of the photon.

The threshold wavelength for a metal is 5000 Å . The maximum K.E. of the photoelectrons emitted when ultraviolet ligh of wavelength 2500 Å falls on it is