Thermionic Emission and Radioactivity — Physics STD 10 — Question

Why is the loudness of the sound heard by a plucked wire increased when it is mounted on a sound board?

State the energy changes which take place when:
A body released from rest from the top of a building.

What is a pulley?

When a tuning fork, struck by a rubber pad, is held over a length of the air column in a tube, it produces a loud sound for a fixed length of the air column. Name the above phenomenon. How does the frequency of the loud sound compare with that of the tuning fork? State the unit for measuring loudness.

Explain the statement ‘the potential difference between two points is 1 volt’.

Name the characteristic which enables one to distinguish the sound of two musical instruments even if they are of the same pitch and same loudness.

What is the nature of the lines of force of the magnetic field due to a straight current carrying wire?

What is the work done when the object acted upon by a force remains at rest?

What is the cause of dispersion?

How is e.m.f. in primary and secondary coils of a transformer related with the number of turns in these coils?