Dual Nature of ...

When an inert gas is filled in place of vacuum in a photo cell, then

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

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

Light from a hydrogen discharge tube is incident on the cathode of a photoelectric cell the work function of the cathode surface is 4.2 eV. In order to reduce the photocurrent to zero the voltage of the anode relative to the cathode must be made

The largest distance between the interatomic planes of a crystal is 10^–7 cm. The upper limit for the wavelength of X-rays which can be usefully studied with this crystal is

The velocity, v, at which the mass of a particle is double its rest mass is

The wavelength of K_α X-rays produced by an X-ray tube is 0.76 Å. The atomic number of the anode material of the tube is

X-ray beam of intensity I₀ passes through an absorption plate of thickness d. If absorption coefficient of material of plate is µ, the correct statement regarding the transmitted intensity I of X-ray is

The K_α X-ray emission line of tungsten occurs λ = 0.021 nm. The energy difference between K and L levels in this atom is about