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qUESTIONS

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]

A straight wire current I is turned into a circular loop. If the magnitude of magnetic moment associated with the is M, the length of wire will be

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 wire of length L carries a current i. If the wire is turned into a circular coil and kept in a uniform magnetic field , the maximum magnitude of torque in the given magnetic field will be

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]

If Mo and Lo denote the orbital angular moment and the angular momentum of the electron due to its orbital motion, then the gyromagnetic ratio is given by

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

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