MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Physics

A simple harmonic progressive wave is given by Y = Y₀ sin 2π `(nt - x/lambda)`. If the wave velocity is `(1/8)^{th}` of the maximum particle velocity, then the wavelength is ______

An electron revolving in a circular orbit of radius 'r' with velocity 'V' and frequency 'v' has orbital magnetic moment 'M'. If the frequency of revolution is doubled then the new magnetic moment will be ____________.

An electron (e) is revolving in a circular orbit of radius 'r' in hydrogen atom. The angular momentum of the electron is (M = magnetic dipole moment associated with it and m = mass of electron) ____________.

An electron of charge 'e' is revolving in a fixed orbit of radius 'r' with frequency 'f'. Its magnetic dipole moment is ____________.

Magnetic moment of revolving electron of charge 'e' and mass 'm' in terms of angular momentum 'L' of electron is ____________.

An electron in the ground state of hydrogen atom is revolving in a circular orbit of radius R. The orbital magnetic moment of the electron is ____________. (m = mass of electron, h = Planck's constant, e = electronic charge)

The pressure at the bottom of a tank containing liquid does not depend upon the ______.

A parallel beam of fast-moving electrons is incident perpendicular on a narrow slit. The distance between slit and screen is large. If the speed of the incident electrons is increased then which one of the following statements is correct?

In the biprism experiment, fringes are obtained using monochromatic light. The distance between the 5^th bright band and 9^th dark band on the same side of the central bright band, in terms of the fringe width 'X' is ______

The radiations of energies 1 eV and 2.5 eV are incident on a metal surface having work function 0.5 eV. The ratio of the maximum velocities of the emitted photo-electrons is ____________.

A light of wavelength '`lambda`' and intensity 'I' falls on photosensitive material. If 'N' photoelectrons are emitted, each with kinetic energy E, then ____________.

When a certain metallic surface is illuminated with monochromatic light of wavelength '`lambda`', the stopping potential for photoelectric effect is '3V₀'. If the same surface is illuminated with a light of wavelength '`2 lambda`', the stopping potential is found as 'V₀'. The threshold wavelength for this surface is ____________.

When light enters glass from vacuum then the wavelength of light ______ 

When a metal with work function 0.6 eV is illuminated with light of energy 2 eV, the stopping potential will be ____________.

When a photosensitive surface is irradiated by lights of wavelengths `lambda_1` and `lambda_2`, kinetic energies of emitted photoelectrons are E₁ and E₂ respectively. The work function of the photosensitive surface is ____________.

Two incident radiations having energies two times and ten times of the work function of a metal surface, produce photoelectric effect. The ratio of maximum velocities of emitted photo electrons respectively is ____________.

An electromagnetic wave of wavelength '`lambda`' is incident on a photosensitive surface of negligible work function. If the photoelectrons emitted from this surface have the de-Broglie wavelength '`lambda_1`' then ____________.

When light of wavelength '`lambda`' is incident on photosensitive surface, photons of power 'P' are emitted. The number of photons (n) emitted in 't' second is (h = Planck's constant, c = velocity of light in vacuum) ____________.

A metal surface having work function 'w₀' emits photoelectrons when photons of energy 'E' are incident on it. The electron enters the uniform magnetic field (B) in perpendicular direction and moves in circular path of radius 'r'. Then 'r' is equal to (m and e be the mass and charge of electron respectively) ____________.

The electron in hydrogen atom is moving in an orbit of radius 0.53 Å. It takes 1.571 x 10^-16 s to complete one revolution. The velocity of electron will be `pi` = 3.142.