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Match List I with List II:

List IList II
A. < 20 HzI. Longitudinal waves
B. > 20000 HzII. Electromagnetic waves
C. X- raysIII. Infrasonic waves
D. Sound wavesIV. Ultrasonic waves

Choose the correct answer from the options given below:

Solution

Correct Option: 4

Frequencies below 20 Hz are infrasonic waves (III). Frequencies above 20000 Hz are ultrasonic waves (IV). X-rays are electromagnetic waves (II). Sound waves are longitudinal waves (I). So A-III, B-IV, C-II, D-I.

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