Advertisements
Advertisements
Question
Explain why, the flash of lightning reaches us first and the sound of thunder is heard a little later.
Advertisements
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
Which property of sound leads of the formation of echoes ?
Name three devices which work on the reflection of sound.
In which medium, air or water, an echo is heard much sooner ? Why ?
Why do we hear more clearly in a room with curtains than in a room without curtains ?
Which of the following device does not work on the multiple reflections of sound waves ?
Explain by giving a scientific reason.
We cannot hear the echo produced in a classroom.
Answer the following question in your own words.
What should be the dimensions and the shape of classrooms so that no echo can be produced there?
State two conditions necessary for hearing an echo.
What is an echo? Write the conditions to hear an echo.
Rohan conducted experiments on echo in different media. He observed that a minimum distance of 'x' meters is required for the echo to be heard in oxygen and 'y' meters in benzene. Compare 'x' and 'y'. Justify your answer.
Speed of sound in oxygen: 340 ms-1
Speed of sound in benzene: 200 ms-1
