WB JEE 2019

The density of the material of a cube can be estimated by measuring its mass and the length of one of its sides. If the maximum error in the measurement of mass and length are 0.3% and 0.2% respectively, the maximum error in the estimation ...

The correct dimensional formula for impulse is given by

When the frequency of the light used is changed from \(4 \times {10^{14}}{s^{ - 1}}\) to \(5 \times {10^{14}}{s^{ - 1}}\), the angular width of the principal (central) maximum in a single slit Fraunhoffer diffraction pattern changes by 0.6 ...

In Young's experiment for the interference of light, the separation between the slits is d and the distance of the screen from the slits is D. If D is increased by 0.5% and d is decreased by 0.3% then for the light of a given wavelength , w...

A body starts from rest, under the action of an engine working at a constant power and moves along a straight line. The displacement s is given as a function of time (t) as