When a tuning fork [vibrating] is held close to the ear, one hears a faint hum. The same [vibrating tuning fork] is held such that its stem is in contact with the table surface, then one hears a loud sound. Explain.
Assume that the displacement of air is proportional to the pressure difference created by a sound wave. Displacement further depends on the speed of sound , density of air and the frequency . If and , then will be of the order of (take the multiplicative constant to be )
The driver of bus approaching a big wall notices that the frequency of his bus's horn changes from to when he hears it after it gets reflected from the wall. Find the speed of the bus if speed of the sound is :
In a resonance tube experiment when the tube is filled with water up to a height of from bottom, it resonates with a given tuning fork. When the water level is raised the next resonance with the same tuning fork occurs at a height of If the velocity of sound in air is the tuning fork frequency is :
