Wavelength
30 cm
35 cm
40 cm
50 cm

30 cm

40 cm

35 cm

50 cm

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Solution

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The distance between a crest and a trough is equal to the half of the wavelength $(λ)$ .
or $20 = λ / 2$
or $λ = 40$ cm

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Wavelength30 cm35 cm40 cm50 cm

The distance between a crest and a trough is equal to the half of the wavelength (λ).or 20=λ/2or λ=40 cm

Wavelength
30 cm
35 cm
40 cm
50 cm

The distance between a crest and a trough is equal to the half of the wavelength $(λ)$ .
or $20 = λ / 2$
or $λ = 40$ cm