Advertisements
Advertisements
Question
On placing your ear close to an iron railing which is tapped some distance away, sound is heard twice. Explain, why?
Advertisements
Solution
The sound produced by the moving wheels of the train travels faster on the iron track than in the air. So, firstly sound produced because of railway track is heard and then heard in the air.
APPEARS IN
RELATED QUESTIONS
What are infrasonics? Can you hear them?
How does a bat make use of ultrasonics waves to find its way?
How does a man’s voice differ from a woman’s voice ?
In fig. shows a snap shot of a wave from of frequency 50 Hz in a string. The numbers in the diagram represents distance in centimeters. Fpr the wave motion, find
(a) Wavelength,
(b) Amplitude,
(c) Velocity.
200 waves pass through a point in one second. Calculate the time period of wave.
The wavelength of the vibrations produced on the surface of water is 2 cm. If the wave velocity is 16 ms-1, calculate:
- no. of waves produced in one second
- time required to produce one wave.
State the effect of pressure on the speed of sound in air.
What is echolocation? How do animals make use of this phenomenon?
Explain the types of mechanical waves.
