Dual Nature of ...

The nature of X-rays spectrum is

A 1 µA beam of protons with a cross-sectional area of 0.5 sq. mm is moving with a velocity of 3 × 10⁴ms^–1.Then charge density of beam is

In the Davission and Germer experiment, the velocity of electrons emitted from the electron gun can beincreased by

A photon of 1.7 × 10^–13 Joules is absorbed by amaterial under special circumstances. The correct statement is

The maximum velocity of an electron emitted by light of wavelength X incident on the surface of a metal of work function ɸ, is
Where h = Planck\'s constant, m = mass of electron and c = speed of light.

When a point source of monochromatic light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and the saturation current are 0.6 volt and 18 mA respectively. If the same source is placed 0.6 m away from the photoelectric cell, then

In a photoemissive cell with exciting wavelength λ, the fastest electron has speed v. If the exciting wavelength is changed to 3λ /4, the speed of the fastest emitted electron will be

Ultraviolet light of wavelength 300 nm and intensity 1.0 watt/m² falls on the surface of a photosensitive material. If 1% of the incident photons produce photoelectrons, then the number of photoelectrons emitted from an area of 1.0 cm² of the surface is nearly

Photoelectric emission is observed from a metallic surface for frequencies v₁ and v₂ of the incident light rays (v₁> v₂). If the maximum values of kinetic energy of the photoelectrons emitted in the two cases are in the ratio of 1 : k, then the threshold frequency of the metallic surface is

Work function of lithium and copper are respectively 2.3 eV and 4.0 eV. Which one of the metal will be useful for the photoelectric cell working with visible light
(h = 6.6 × 10^–34 J-s, C = 3 × 10⁸ m/s)