What is the minimum distance (in metres) required to hear an echo?

Related MCQs

• Two bodies kept at a certain distance feel a gravitational force F to each other. If the distance between them is made double the former distance, the force will be -
• Which phenomenon is responsible for the echo of sound wave?
• Which one of the following animals can hear ultrasonic sound?
• Human beings can hear the sound range between:
• A bomb explodes on the moon. You will hear its sound on earth after –
• When we hear a sound, we can identify its source from             .
• Why are we able to hear short wave broadcasts better than long wave broadcasts?
• A boy is standing in front of a plane mirror at a distance of 3 m from it. What is the distance between the boy and his image?
• An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed?
• A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of energy/velocity after rebounding?