Advertisements
Advertisements
Question
Boojho saw a cracker burst at night at a distance from his house. He heard the sound of the cracker a little later after seeing the cracker burst. Give reason for the delay in hearing the sound.
Solution
The light travels faster than sound. So, the light from the cracker reaches faster than that of sound of the cracker.
Speed of light in air = 3 × 108 m/s
Speed of sound in air = 330 m/s
APPEARS IN
RELATED QUESTIONS
Suggest measures to avoid noise pollution in classroom.
Your parents are going to buy a house. They have been offered one on the roadside and another three lanes away from the roadside. Which house would you suggest your parents should buy? Explain your answer.
What is meant by noise pollution?
What do you do in the following situations:
Exposed to a series of firecrackers with high sound level.
What is the safe limit of sound level in dB for our ears?
Name one source of sound causing noise pollution.
Look at a cartoonist's presentation of a kind of pollution given below.
 |
- Name the kind of pollution.
- List the sources of pollution.
- Mention any two harmful effects of this pollution.
Short answer type question
Dandiya raas is not allowed after 10.00 pm. Why?
Which of the following may be caused by noise?
Unwanted disturbing sound, even if it is music next door, is noise.
