Chapter Test: Dual Nature of Matter and Radiation - 1 JEE Physics Free

When a metallic surface is illuminated with monochromatic light of wavelength λ, stopping potential for photoelectric current is 3 V₀. When the same metallic surface is illuminated with a light of wavelength 2λ, the stopping potential is V₀. The threshold wavelength for the surface is-

In a photo emissive cell with executing 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 -

A source of light is placed at a distance of 1 m from a photocell and cut-off potential is found to be V₀. If the distance is doubled, the cut-off potential will be -

The threshold frequency for a metallic surface corresponds to an energy of 6.2 eV, and the stopping potential for a radiation incident on this surface is 5V. The incident radiation lies in -

Light of wavelength 400 nm is incident continuously on a cesium ball (work function 1.9 eV) The maximum potential to which the ball will be charged is-

A metallic surface ejects photoelectrons when hit by green light but none when hit by yellow light. Will the electrons be ejected if the same surface is hit by red light ?

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 -

The rest mass of a photon is -

A photocell employs photoelectric effect to convert -

Threshold wavelength for photoelectric emission from a metal surface is 5200 Å. Photoelectrons will be emitted when this surface is illuminated with monochromatic radiation from -

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material, photoelectric current is emitted. If the frequency of light is halved and intensity is doubled, the photoelectric current becomes -

The graph between the frequency of incident light and the stopping potential is a -

An image of the sun is formed by a lens of focal length 30 cm on the metal surface of a photoelectric cell and it produces a current I. The lens forming the image is then replaced by another lens of the same diameter but of focal length of 15 cm. The photoelectric current in this case will be -

(In both cases the plate is kept at focal plane and normal to the axis lens)

When a metallic surface is illuminated with monochromatic light of wavelength λ, the stopping potential is 5V0. When the same surface is illuminated with light of wavelength 3λ, the stopping potential is V₀. Then the work function of the metallic surface is -

The threshold wavelength for photoelectric emission from a material is 5200 Å. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a

Light of wavelength λ strikes a photo-sensitive surface and electrons are ejected with kinetic energy E. If the kinetic energy is to be increased to 2E, the wavelength must be changed to λ' where -

The maximum velocity of an electron emitted by light of wavelength λ incident on the surface of a metal of work function W is -

Given h = 6.6 × 10^-34 joule sec, the momentum of each photon in a given radiation is 3.3 × 10^-29 kg metre/sec. The frequency of radiation is

If the work function of a material is 2eV, then minimum frequency of light required to emit photo-electrons is 

The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential is

In an experiment of photoelectric emission for incident light of 4000 Â, the stopping potential is 2V. If the wavelength of incident light is made 3000 Â, then stopping potential will be

In the above experimental set up for studying photoelectric effect, if keeping the frequency of the incident radiation and the accelerating potential fixed, the intensity of light is varied, then