Question

8. What is the wavelength of a sound wave that has a speed of 250 m/s and a frequency of 400 Hz?



9. What is the wave speed of a wave that has a frequency of 50 Hz and a wavelength of 2.0 m?




10. What is the wave speed of a wave that has a frequency of 100 Hz and a wavelength of 0.50 m?

Answer 1

Answer:

Correct answer:  8. λ = 0.625 m ; 9. v = 100 m/s ; 10. v = 50 m/s

Explanation:

The formula linking wavelength, speed and frequency is as follows:

λ = v / f

We will use this formula in all three questions

8. Given: speed v = 250 m/s, frequency f = 400 Hz

required: wavelength λ = ?

λ = v / f = 250 / 400 = 0.625 m

λ = 0.625 m

9. Given:  frequency f = 50 Hz, wavelength λ = 2 m

required:  speed v = ?

v = λ · f = 2 · 50 = 100 m/s

v = 100 m/s

10. Given:  frequency f = 100 Hz, wavelength λ = 0.5 m

required:  speed v = ?

v = λ · f = 0.5 · 100 = 50 m/s

v = 50 m/s

God is with you!!!

Answer 2

(8) velocity= 250m/s

    frequency= 400 hz

    wavelength= ?

      wavelength= 250/400

       = 0.625 m

(9) frequency= 50 hz

     wavelength= 2.0 m

     velocity= ?

     velocity= wavelength × frequency

        = 2 × 50

         velocity = 100 m/s

(10) frequency= 100 hz

      wavelength= 0.50 m

      velocity= ?

      velocity= wavelength × frequency

                   = 100×0.50

                    velocity = 50 m/s

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