Mechanical Properties of Solids — Physics STD 11 Science — Question

Two point sources of sound are kept at a separation of 10cm. They vibrate in phase to produce waves of wavelength 5.0cm. What would be the phase difference between the two waves arriving at a point 20cm from one source-

1. On the line joining the sources.
2. On the perpendicular bisector of the line joining the sources?

Evaluate Rydberg constant by putting the values of the fundamental constants in its expression.

To calm the sea waves, oil is put on them. Why?

In an electric store heat keeps on coming out continously, yet its temperature becomes stable after some time. Why?

What are the conditions for equilibrium of floating bodies?

Discuss the variation of mass with velocity.

Derive an expression for work done against gravity.

Find the temperature at which root mean square velocity of a gas is half of its value at 0°C, while pressure remaining constant.

Draw the graph showing the variation of potential energy and kinetic energy of a block attached to a spring, which obeys Hooke's law.

The net charge in a current-carrying wire is zero. Then, why does a magnetic field exert a force on it?