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

In a biprism experiment, monochromatic light of wavelength (λ) is used. The distance between two coherent sources is kept constant. If the distance between slit and eyepiece (D) is varied as D₁, D₂, D₃, and D₄, the corresponding measured fringe widths are z₁, z₂, z₃, and z₄ then ______ 

In the biprism experiment, a source of monochromatic light is used for a certain distance between slit and eyepiece. When the distance between two virtual sources is changed from d_A to d_B, then the fringe width is changed from Z_A to Z_B. The ratio Z_A to Z_B is ______

Light waves from two coherent sources arrive at two points on a screen with a path difference of zero and λ/2. The ratio of the intensities at the points is ______ 

The wavelength '`lambda`' of a photon and de-Broglie wavelength of an electron have same value. The ratio of energy of a photon to kinetic energy of electron is (m = mass of electron, c = velocity of light, h = Planck's constant) ____________.

If '`lambda_1`' and '`lambda_2`' are de-Broglie wavelengths for electrons in first and second Bohr orbits in hydrogen atom, then the ratio '`lambda_2`' to '`lambda_1`' is (E₁ = -13.6 eV) ____________.

If the kinetic energy of a particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is ____________.

Graph shows the variation of de-Broglie wavelength `(lambda)` versus `1/sqrt"V"`, where 'V' is the accelerating potential for four particles carrying same charge but of masses m₁ , m₂, m₃, m₄. Which particle has a smaller mass?

If the potential difference used to accelerate electrons is doubled, by what factor does the de-Broglie wavelength associated with the electrons change?

Let v₁ and v₃ be the frequency for series limit of Balmer and Paschen series respectively. If the frequency of first line of Balmer series is v₂ then, relation between v₁ and v₂ and v₃ is ____________.

In hydrogen atom, the product of the angular momentum and the linear momentum of the electron is proportional to (n = principal quantum number) ____________.

In hydrogen spectrum, which of the following spectral series lies in ultraviolet region?

The radii of the first four Bohr orbits of hydrogen atom are related as ____________.

In hydrogen spectrum, the series of lines obtained in the ultraviolet region of the spectrum is ____________.

A particle moves along a circular path of radius 'r' with uniform speed 'V'. The angle described by the particle in one second is ______.

In the case of conical pendulum, if 'T' is the tension in the string and 'θ' is the semi-vertical angle of cone, then the component which provides necessary centripetal force is ______.

According to de-Broglie hypothesis, the ratio of wavelength of an electron and that of photon having same energy 'E' is (m = mass of electron, c = velocity of light) ____________.

A photon of wavelength 3315 Å falls on a photocathode and an electron of energy 3 x 10^-19 J is ejected. The threshold wavelength of photon is [Planck's constant (h) = 6.63 x 10^-34 J.s, velocity of light (c) = 3 x 10⁸ m/s] ____________.

The velocity of sound at 0 °C is v0. What will be its velocity at 819 °C?

In Young's double-slit experiment, if the two sources of light are very wide, then ______.

A pipe closed at one end produces a fundamental note of frequency 'v'. It is cut into two pipes of equal length. The fundamental frequencies produced in the two pipes are ______.