The end correction for the vibrations of air column in a tube of circular cross-section will be more if the tube is

$A$ stone of mass $m$ is tied to a string and is moved in a vertical circle of radius $r$ making $n$ revolutions per minute. The total tension in the string when the stone is at its lowest point is

An object takes $n$ times as much time to slide down a $45^{\circ}$ rough inclined plane as it takes to slide down a perfectly smooth inclined plane of the same inclination. The coefficient of kinetic friction between the object and the rough incline is given by:

The wavelength of a photon is equal to the wavelength of an electron moving with a kinetic energy of $1.5\, eV$. What is the energy of the photon?

Doctors use a stethoscope to hear the sounds produced during each cardiac cycle. The second heart sound is heard when:

The centre of mass of a system of particles does not depend on: