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

The maximum velocity of the photoelectron emitted by the metal surface is 'v '. Charge and mass of the photoelectron is denoted by 'e' and 'm' respectively. The stopping potential in volt is ______.

For photoelectric emission from certain metal, the cut-off frequency is v. If radiation of frequency 2v impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass) ____________.

In a spring-block system, length of the spring is increased by 5%. The time period will ____________.

The rms value of current in a 50 Hz AC circuit is 6 A. The average value of AC current over a cycle is ____________.

When a light of wavelength 4000 Å falls on a photoelectric emitter, photoelectrons are liberated. For another emitter, light of wavelength 6000 Å is sufficient for photo emission. The work functions of the two emitters are in the ratio of ____________.

Threshold frequency for a metal is 10¹⁵ Hz. Light of `lambda` = 4000 Å falls on its surface. Which of the following statements is correct?

A metal surface is illuminated by light of given intensity and frequency to cause photoemission. If the intensity of illumination is reduced to one-fourth of its original value then the maximum KE of the emitted photoelectrons would be ______.

A particle is performing a linear simple harmonic motion of amplitude 'A'. When it is midway between its mean and extreme position, the magnitudes of its velocity and acceleration are equal. What is the periodic time of the motion?

The work function of a metal is 1.6 x 10^-19 J. When the metal surface is illuminated by the light of wavelength 6400 Å, then the maximum kinetic energy of emitted photo-electrons will be (Planck's constant h = 6.4 x 10^-34 Js) ____________.

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 tripled then the new magnetic moment will be ____________.

The equation of standing wave is y = a cos kx sin `omega"t"`. Which one of following graphs is for the wave at t = T/4?

The critical angle for light going from medium 'x' to medium 'y' is 'θ'. The speed of light in medium 'x' is 'v_x'. The speed of light in medium 'y' is ______.

An alternating voltage is given by E = 100 sin`(omega + pi/6)"V"`. The voltage will be maximum for the first time when is ______. [T = periodic time]

In half-wave rectifier, the RMS value of A.C. component of the wave is ____________.

A particle executes simple harmonic motion and is located at x = a, b, and c at times t₀, 2t_0, and 3t₀ respectively. The frequency of the oscillation is ______.

The work function of a metallic surface is 5.01 eV. The photoelectrons are emitted when light of wavelength 2000 Å falls on it. The potential difference applied to stop the fastest photoelectrons is [h = 4.14 x 10^-15 eV sec] ____________.

A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. The potential difference developed across the ring when its speed is v, is ____________.

Photoelectrons emitted from a metallic surface are initially ____________.

In photoelectric experiment, if both the intensity and frequency of the incident light are doubled, then the saturation of photoelectric current ______.

The forbidden energy band gap in conductors, semiconductors and insulators are `"E"_("g"_1), "E"_("g"_2) "and"  "E"_("g"_3)` respectively. The relation among them is ____________.