Advertisements
Advertisements
Question
Give an example to show that light travels faster than sound?
Advertisements
Solution
Lightning:
The most common example of showing that light travels faster than sound is lightning. Whenever lightning strikes, you see the lightning first and then hear the thunder after some time.
APPEARS IN
RELATED QUESTIONS
Write true or false for a given statement.
The frequency is measured in hertz.
How is sound produced ?
How is it possible to recognize a person by his voice without seeing him?
What is loudness of sound? What factors does it depend on?
When we change a feeble sound to a loud sound, we increase its :
In which medium the speed of sound is more: humid air or dry air? Give a reason to your answer.
A thin metal plate is placed against the teeth of cog wheel. Cog wheel is rotated at a speed of 120 rotations per minute and has 160 teeth. Calculate:
- frequency of node produced.
- speed of sound, if wavelength is 1.05 m.
- what will be the effect when the speed of cog wheel is doubled?
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 time period.
A person fires a gun and other boy at a distance hears the sound of the fire 2.5 s after seeing the flash. If the speed of sound in air is 330 ms-1, find the distance between the boys.
