List of top Physics Questions

What is the magnetic field at the centre of a current-carrying loop?
If light intensity is known, how is non-reflecting momentum calculated?
For a microscope with objective \( f_o = 1 \, \text{cm} \), eyepiece \( f_e = 10 \, \text{cm} \), and image distance \( v = 25 \, \text{cm} \), find total magnification.
Given \( E(t) = 108t - 22 \), how is velocity derived from the electric field?
How can energy losses in a transformer be minimised?
What is the Bohr radius of a hydrogen atom?
If current drops from 4 A to 0 A in 0.5 s, and voltage is 120 V, find the self-inductance.
What is the ratio of the de Broglie wavelengths for an electron and a proton if both have equal kinetic energy?
What are the dimensional formula units for voltage?
A relation connecting the isotopic mass \(M\) of a superconductor with its critical temperature \(T_c\) is given by:
What is the shape of the phase space trajectory for a harmonic oscillator?
\(\dfrac{n\alpha}{3\epsilon_0} = \dfrac{(\epsilon_r - 1)}{(\epsilon_r + 2)}\) is known as ____________ relation.
Which of the following is the Debye temperature?
The Lagrangian of a system is given by \(L = \tfrac{1}{2}\dot{q}^{2} + q\dot{q} - \tfrac{1}{2}q^{2}\). It describes the motion of:
A particle is constrained to move on a parabola \(y = kx^{2}\). The number of degrees of freedom is:
The combination of one u-quark and two d-quarks is called:
A particle with rest mass \(m\) is at rest and decays into two particles of equal rest mass \(\tfrac{3}{10}m\), which move along the z-axis. Their velocities are given by:
The recoil momentum of an atom is \(p_A\) when it emits an infrared photon of wavelength 1500 nm, and \(p_B\) when it emits a photon of visible wavelength 500 nm. The ratio \(p_A/p_B\) is:
The atomic packing factor of a diamond cube structure is:
According to the uncertainty principle, what is the minimum possible phase space volume that a quantum harmonic oscillator can occupy?
The normalized wave functions \(\psi_1\) and \(\psi_2\) correspond to the ground state and the first excited state of a particle in a potential. The operator \(\hat{A}\) acts on the wave functions as \(\hat{A}\psi_1 = \psi_2\) and \(\hat{A}\psi_2 = \psi_1\). The expectation value of the operator \(\hat{A}\) for the state \(\psi = (3\psi_1 + 4\psi_2)/5\) is:
A particle of mass \(m\) is confined in the ground state of a one-dimensional box extending from \(x = -2L\) to \(x = +2L\). The wave function of the particle in this state is \(\psi = \psi_0 \cos\dfrac{\pi x}{4L}\), where \(\psi_0\) is a constant. The energy eigenvalue corresponding to this state is:
The commutator \([x^2, p_x]\) is equal to:
The primitive translation vectors of a two-dimensional lattice are \(\vec{a} = 2\hat{i} + \hat{j}\), \(\vec{b} = 2\hat{j}\). The primitive translation vector of its reciprocal lattice in the \(x\)-direction is given by:
A radioactive nucleus can decay by two different processes. The half-life for the first process is \(t_1\), and that for the second process is \(t_2\). The effective half-life \(\tau\) of the nucleus is given by: