Advertisements
Advertisements
Question
Explain why, the flash of lightning reaches us first and the sound of thunder is heard a little later.
Solution
Since light travels faster than sound, the flash of lightning is seen first and the sound of thunder is heard thereafter.
APPEARS IN
RELATED QUESTIONS
An echo returned in 3 s. What is the distance of the reflecting surface from the source, given that the speed of sound is 342 m s−1?
Name three devices which work on the reflection of sound.
Name the device which is used to address a small gathering of people.
Fill in the blank with suitable word :
An echo is simply a ................... sound.
Why do we hear more clearly in a room with curtains than in a room without curtains ?
Answer the following question in your own words.
What is an echo?
What is the minimum distance needed for an echo?
______ is an image obtained by the use of reflected ultrasonic waves.
Assertion: The sound which we hear again is called Echo.
Reason: The sensation of sound (Echo) persists in our brain for about 1 s.
Numerical problems:
An echo returned in 3s. What is the distance of the reflecting surface from the source given that the speed of sound is 330 ms-1?
