For
the constant pressure and temperature, the velocity
of the sound varies inversely to the square root of
its density i.e.
where, v is
the velocity of the sound in air and
is the density of gas.
As the
density of oxygen gas is greater than that of the
hydrogen, the velocity of sound in hydrogen is greater
than that of the oxygen.
43. Which is the most fundamental property of a wave?
Why?
44. Why are stationary waves called so?
45. What causes the rolling sound of a thunder?
46. A closed earthen vessel (Surai) is gives. Can we
distinguish when the vessel is filled or empty without
lifting it and looking inside. Justify your answer.
47. Differentiate between forced vibration and free
vibration.
48.