PLEASE HELP ME!!!! I’LL MARK YOU BRAINLIEST IF YOU ANSWER THIS CORRECTLY!!!!! I NEED THESE DONE TODAY!!!! The speed of sound in

Question

PLEASE HELP ME!!!! I’LL MARK YOU BRAINLIEST IF YOU ANSWER THIS CORRECTLY!!!!! I NEED THESE DONE TODAY!!!!

The speed of sound in air at 20 deg C. is approximately 340 m/s

True
False
Wave speed = wave frequency x wave length

True
False

Because f=1/period, wave speed = wavelength/period

True
False

What is the wavelength of a sound wave that has a speed of 340m/s and a frequency of 440 hz

0.773 m

149,600 m

1.29 m

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

25 m/s

100 m/s

0.04 m/s

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Euphemia 4 years 2021-08-24T13:03:39+00:00 1 Answers 15 views 0

Answers ( )

  1. minhkhue
    0
    2021-08-24T13:05:21+00:00
    Reply

    Answer:

    1)

    TRUE

    2)

    TRUE

    3)

    TRUE

    4)

    \lambda = 0.773 m

    5)

    v = 100 m/s

    Explanation:

    1)

    As we know by the formula of speed of sound we have

    v = 332 + 0.6 t

    t = 20 deg C

    v = 332 + (0.6 \times 20)

    v = 332 + 12 = 344 m/s

    So approx speed of the sound is nearly 340 m/s

    so its TRUE

    2)

    Wave speed is given as

    v = \frac{\lambda}{T}

    so it is given as

    v = f \lambda

    TRUE

    3)

    f = \frac{1}{T}

    so from above equation we have

    v = f \times \lambda

    v = \frac{\lambda}{T}

    4)

    Wavelength is given as

    \lambda = \frac{v}{f}

    \lambda = \frac{340}{440}

    \lambda = 0.773 m

    5)

    As we know that

    f = 50 Hz

    \lambda = 2.0 m

    so we will have

    v = \lambda f

    v = 50 \times 2

    v = 100 m/s

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