Physics · Wave Motion and Sound

Explanation:

The speed of a wave can be calculated using the formula:

v = fλ

where v is the wave speed, f is the frequency of the wave, and λ is the wavelength of the wave.

As we know that:

f = 1/T

So,

v = λ/T

Where T is the period of the wave.

Hence the speed of the wave is equal to fλ and λ/T.

This formula correctly represents the speed of a wave, where f is the frequency and λ is the wavelength.

This formula is also correct because the frequency f is the reciprocal of the period T, i.e., f = 1/T.

Both formulas fλ and λ/T correctly represent the wave speed, making this option correct.

This formula is incorrect as it does not represent wave speed. Multiplying wavelength by the period does not yield a correct dimension for speed.