Sounds Waves And Motion - Study Mode

[#116] A boy clapped near a rock and after 3 seconds he heard an echo. If the speed of sound is 346 meters sec -1 , then what distance is from the boy and the rock?
Correct Answer

(B) 519 m

[#117] Arrange the following medium - solids, liquids and gases, in descending order of speed of sound through them.
Correct Answer

(A) Solids, liquids, gases

[#118] Sound waves with frequency below the audible range are called-
Correct Answer

(D) Infrasonic

[#119] Sound of frequencies below 20 Hz are called . . . . . . . .
Correct Answer

(A) infrasonic sound

[#120] Stationary waves are so called because in them
Correct Answer

(A) same occurs no flow of energy