Echoes and Vibrations of Sound Physics - Echoes and Vibrations of Sound

How does frequency affect a musical sound?

A type of electromagnetic wave has a wavelength of 50 Å. Name the wave and state one use of this type of wave.

Name the subjective property of light related to its wavelength.

Three musical instruments give out notes at the frequencies listed below. Flute: 400 Hz; Guitar: 200 Hz; Trumpet: 500 Hz. Which one of these has the highest pitch?

Name the subjective property of sound related to its frequency.

A boy stands 66.4 m in front of a high wall and then blows a whistle. Calculate the time interval when he hears an echo. (Speed of sound = 332m/s).

What is the noise? Give an example.

What is musical sound? Give an example.

A ship which is stationary at a distance of 680 m from the shore, sends a signal to the coast. Its echo is heard in 4s. Find the velocity of sound.

An observer standing in front of a vertical wall claps 10 times one second. He adjusts his distance from the wall in such a way that the second of his clapping coincides with the echo. This happens when bis distance from the wall is 17.5m. What is the velocity of sound heard by him?

A cork piece is floating on the surface of the water in a pond. A piece of pebble is dropped into the water. What will be your observation?

Explain why are soldiers asked to walk out of step while crossing bridges?

When a troop crosses a suspension bridge the soldiers are asked to break steps. Explain the reason.

The rearview mirror of a motorbike starts vibrating violently at some particular speed of the motorbike. What is the name of the phenomenon taking place? Why does the happen?