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qUESTIONS

The wavelength ‘λ’ of a photon and the De-Broglie wavelength of a electron have same value. The ratio of energy of a photon to kinetic energy of electron is :(m = Mass of electron, c = Velocity of light,h = Planck’s constant) [MHT-CET 2023]

An electron of mass (m) having de-Broglie wavelength ‘λe’ and a proton of mass (m) having de-Broglie wavelength ‘λp’ are accelerated through the same potential difference. The ratio of ‘λe’ to ‘λp’ is: [MHT-CET 2023]

In photoelectric effect, when certain metallic surface is illuminated with monochromatic light of wavelength ‘λ’, the stopping potential is ‘3V’. If the same surface is illuminated with light of wavelength ‘2λ’, the stopping potential is ‘V’. The threshold wavelength for this surface is : [MHT-CET 2022]

In a photoelectric emission experiment, the stopping potential for a given metal is ‘V’ volt, when radiation of wavelength ‘λ’ is used. If radiation of wavelength ‘2λ,’ is used with the same metal, then the stopping potential (in volt) will be: [c = velocity of light, e = charge on electron, h = Planck’s constant] [MHT-CET 2023]

In photoelectric experiment the stopping potential was measured to be ‘V1’ and ‘V2’ volt with incident light of wavelength ‘λ’ and ‘λ/2’ respectively. The value of V2 is : [MHT-CET 2023]

A photoelectric surface is illuminated successively by monochromatic light of wavelength ‘λ’ and ‘λ/2’. If the maximum kinetic energy of the emitted photoelectrons in the first case in one-third that in the second case, the work function of the surface of the material is (c = speed of light, h = Planck’s constant.) [MHT-CET 2023]

A photon of energy ‘E’ ejects photoelectrons from a metal surface whose work function is W. If this electron enters into uniform magnetic field of induction ‘B’ in a direction perpendicular to field and describes a circular path of radius ‘r’, then radius is given by: [MHT-CET 2022]

The maximum velocity of an electron emitted by light of wavelength ‘λ’ incident on a metal of work function ‘Φo’ is: [MHT-CET 2022]

Photoelectric emission is observed from a metallic surface for frequencies ‘v1’ and ‘v2’ of the incident light rays. If the ratio of maximum value of the kinetic energy of the photoelectrons emitted in first case to that in second case is 2: K, then the threshold frequency of the metallic surface is :[MHT-CET 2023]

There are n1 photons of frequency v1 in a beam of light. In an equally energetic beam there are n2 photons of frequency v2. Then the correct relation

1 2 3

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