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?

Correct  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!!!

(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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r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

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