Physics
Grade-8
Easy

Question

Sound from a speaker undergoes an echo to reach the source back from a mountain located at a distance of 332 m from the source. The total time taken by the sound to cover this distance is 2 s. The speed of sound is ___ m/s.

  1. 211
  2. 310
  3. 332
  4. 244

hintHint:

Distance= speed × time

The correct answer is: 332


    • The distance between the source and the mountain = 332m .
    • After echo, the total distance = 332+332m.
    • Total distance travelled by sound = 664m.
    • And total time taken = 2sec.
    • By using formula: Distance= speed × time.
    • We get, 662= speed × 2 
    • Therefore speed = 662/2
    • Hence, Speed = 332m/s.
    • So, the correct option is c.

    • After echo the total distance covered by the sound = 2d.

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