Advertisements
Advertisements
Question
Distinguish between light and sound waves. What are the consequences of the large difference in the speed of sound and that of light? Briefly explain them.
Solution
Light waves are electromagnetic waves while the sound waves are mechanical waves. Light waves do not require any material medium for their propagation while sound waves need the material medium for its travel from one place to another.
Due to the large magnitude of difference between the speed of light (i.e 3 X 108 m/s) to the speed of sound in air (330 m/s) , the light reaches first and then the sound from the object. Like, in thunderstorms, the light reaches first to earth and then the person hears the sound of light.
APPEARS IN
RELATED QUESTIONS
Draw displacement-time graph of a wave and show on it the amplitude and time period of wave.
What is the audible range of frequency for human?
A medium is necessary for ______ of sound.
Select the correct option:
A part of longitudinal wave in which particles of the medium are farther away than the normal particles is called :
The distance between one crest and one trough of a sea wave is 4.5 m. If the waves are produced at the rate of 240/min, calculate the wave velocity.
The sound of which of the following frequency is audible to us?
2 Hz, 1000 Hz, 200 kHz, 8 MHz
What type of sound is produced by elephants and whales?
A key of a mechanical piano struck gently and then struck again but much harder this time. In the second case
Name two musical instruments which produce sound by vibrating strings.
Unwanted sounds are called ______.
