SOUND

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Across
  1. 4. / String instrument
  2. 6. / Unpleasant Sounf
  3. 9. Number of oscillation per second.
  4. 10. / One complete to and from motion.
Down
  1. 1. Maximum displacement of particles of medium.
  2. 2. / Electromagnetic wave.
  3. 3. Mechanical wave
  4. 5. period / Time required for one oscillation.
  5. 7. / S I Unit of Frequency.
  6. 8. / Reflected Sound.