Class IX

What do dolphins, bats and porpoise use
  1. Ultrasound
  2. Infrasound
  3. Both a and b
  4. None of these
Speed of sound depends upon
  1. Temperature of the medium
  2. Pressure of the medium
  3. Temperature of source producing sound
  4. Temperature and pressure of medium
To hear a distinct echo each time interval between the original sound and the reflected sound must be:
  1. 0.2s
  2. 1s
  3. 2s
  4. 0.1s
Speed (v) abs wavelength ( �) and the frequency (v) of sound are related as
  1. λ= v X v
  2. v= λ X v
  3. v= λ X v
  4. v= λ / v
Speed of sound depends upon
  1. Temperature of the medium
  2. Pressure of the medium
  3. Temperature of source producing sound
  4. Temperature and pressure of medium
Time Elapsed

HR : MIN : SEC
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