Find out wavelength, frequency and time period of the wave

CBSE Class 9 CBSE Class 9 Science
1

A source of wave produces 50 crests and 50 trough in 0.1 s. The distance between a crest and next trough is 20 cm. Find out

  1. wavelength
  2. frequency and
  3. time period of the wave.
2
  1. Since, we know that the distance between a crest and next trough is image where λ is wavelength of the wave. Therefore, image = 20 cm.
    ∴ λ = 40 cm
  2. The pluse produces by the source is 0.1 s.
    ∵ Frequency of a wave = image
  3. ∵ Time period of a wave, T = image
    image = 2 x 10–3s