31. An echo comes back in 3 seconds. If the speed of sound is 342 ms-1, what is the distance from the source to the reflecting surface?
32. Sound cannot pass through
33. When the speed of an object exceeds to the speed of sound, it is said to travel at . . . . . . . . speed.
34. Which one of the following statements is not correct?
35. The sound wave travels at a speed of 339 m/s-1. If its wavelength is 1.5 cm, what will be the frequency of the wave?
36. A person rings, a metallic bell near a strong concrete wall. He hears the echo after 0.3 s. If the sound moves with a speed of 340 m/s, how far is the wall from him?
37. SONAR is based on the principle of
38. The frequency (in Hz) of a note that is one octave higher than 500 Hz is
39. Which of the following is an example of simple harmonic motion?
40. If Va, Vw and Vs respectively are the speed of sound in air, water and steel, then
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