Question

When the C3 key on a piano keyboard is pressed, a string inside the piano

Answer 1

Answer:

Part a)

Frequency of sound is 130 Hz

Part b)

Wavelength of the sound is 2.65 m

Explanation:

Part a)

Frequency of source of the sound is same as the frequency of the sound

Here we know that motion of hammer is back and fourth with frequency

f = 130 cycles per second

so frequency of sound is same as frequency of hammer motion

so we have

$f_{sound} = 130 Hz$

Part b)

As we know that the speed of sound is

v = 345 m/s

We know that the frequency of sound is

f = 130 Hz

now the wavelength is given as

$\lambda = \frac{v}{f}$

$\lambda = \frac{345}{130}$

$\lambda = 2.65 m$