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qUESTIONS

According to Einstein’s photoelectric equation, the correct graph between the kinetic energy (K.E.) of photoelectrons emitted and the frequency (v) of incident radiation is: [MHT-CET 2021]

If the de-Broglie wavelength of the electron in the ground state is ‘λ,’ and that in the n = 4 level is ‘2’, then: [MHT-CET 2022]

Energy of photon whose frequency is 10^12 MHz is: [MHT-CET 2022]

The work functions for metals A, B and C are 1.92 eV, 2.0 eV and 5 eV respectively. The metal(s) which will emit photoelectrons for incident radiation of wavelength 4100 Å is/are:

The magnetic moment produced in a sample of 2 gram is 8 x 10-7 A/m2. lf its density is 4g/cm3, then the magnetization of the sample in AM^-1 is

for an electron of charge e and mass m, the gyromagnetic ratio is

The energy that should be added to an electron to reduce its de-Broglie wavelength from 10^-10 m to 0.5 x 10^-10 m will be: [MHT-CET 2022]

Two wires of same length are shaped into a square and a circle. If they carry same current, ratio of the magnetic moment is

If the voltage in an a. c. circuit is represented by the equation V = 220sin(314t – phi) then r.m.s. value of the voltage is:

In series L-C-R circuit C = 2µF, L = 1mH and R = 102. What is the ratio of energies stored in the inductor to that of capacitor when the maximum current flows in the circuit?

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