1. A wave appears in a pool. Its wavelength is 32 cm, and its frequency is 2 Hz. What is its spread velocity?

Known : wavelength, λ = 32 cm = 0.32 m

Frequency, f = 2.0 Hz

Asked : spread velocity (v)

Formula : v = f x λ

Solution : v = f x λ

= 2.0 Hz x 0.32 m = 0.64 m/s

2. An earthquake can produce three kinds of waves. One of them is transversal wave of the type called S-wave. The S-wave moves with a spread velocity of 5,000 m/s. its wavelength is 417 m. what is its frequency?

Known : spread velocity, v = 5,000 m/s

wavelength, λ = 417 m

Asked : frequency (f )

Formula : v = f x λ or f =

Solution : f =

= = 12 Hz

3. A flute produces a sound wave with a wavelength of 2.0 m and a spread velocity of 340 m/s. What is its frequency?

Known : spread velocity, v = 340 m/s

wavelength, λ = 2.0 m

Asked : frequency (f )

Formula : v = f x λ or f =

Solution : f =

= = 170 Hz

Source: science student book grade VIII

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