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

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 ____________.

Two parallel plates separated by a distance 'd' are kept at potential difference 'V' volt. A charge 'q' of mass 'm' enters in parallel plates with some velocity. The acceleration of the charged particle will be ______ 

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 potential differences that must be applied across the parallel and series combination of 3 identical capacitors are such that the energy stored in them becomes the same. The ratio of potential difference in parallel to series combination is ______

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.

The ratio of slopes m1: ro2 of the lines given in the following graphs is, ______.

In an atom, electron of charge (-e) perform U.C.M. around a stationary positively charged nucleus, with period of revolution 'T'. If 'r' is the radius of the orbit of the electron and 'v' is the orbital velocity, then the circulating current (I) is proportional to ____________.

A light of frequency 'v' is incident on the metal surface whose threshold frequency is 'v₀'. If v = v₀, then [c = speed of light in medium] ____________.

The earth moves around the sun in an elliptical orbit as shown in the figure. The ratio, `"OA"/"OB"` = x. The ratio of the speed of the earth at Band at A is ______.

In experiment of photoelectric effect, the stopping potential for incident yellow light of wavelength 5890 Å is 4 volt. If the yellow light is replaced by blue light of wavelength 4000 Å, the stopping potential is ____________.

When the work function of a metal increases, maximum kinetic energy of emitted photoelectrons ____________.

Which one of the following graphs represents the variation of photoelectric current (i) with intensity (I) of the incident light?