Advertisements
Advertisements
प्रश्न
When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?
उत्तर
An echo is heard when the time interval between the original and reflected sounds is at least 0.1 s. The speed of sound in a medium increases with an increase in temperature. Hence, the time interval between the original sound and the reflected sound will decrease on a hotter day. Therefore, an echo can be heard only if the time interval between the original sound and the reflected sound is greater than 0.1 s.
APPEARS IN
संबंधित प्रश्न
Does sound follow the same laws of reflection as light does? Explain.
Name the device which is used to address a small gathering of people.
Name any two objects which are good reflectors of sound.
State the laws of reflection of sound.
A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo ? Speed of sound in air is 330 m/s.
A man is kidnapped, blindfolded and imprisoned in a big room. How could the man tell if he was in : a furnished room
Answer the following question in your own words.
Study the construction of the Golghumat at Vijapur and discuss the reasons for the multiple echoes produced there.
When sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound remain the same. Do you hear an echo sound on a hotter day? Justify your answer.
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
