Physics Past Questions and Answers

Light of energy 5eV falls on a metal of work function 3eV and electrons are liberated. The stopping potential is

The velocity y of a particle in a time t is given by the equation
y = 10 + 2t²
Find the instantaneous acceleration after 5 seconds

A simple pendulum has a period of 17.0s. When the length is shorten by 1.5m, its period is 8.5s. Calculate the original length of the pendulum

A sonometer wire is vibrating at frequency f_o. If the tension in the wire is doubted while the length and the mass per unit length are kept constant, the new frequency of vibration is

A travelling wave moving from left to right has an amplitude of 0.15m, a frequency of 550Hz and a wavelength of 0.01m. The equation describing the wave is