The ratio between initial and final speed is 3:4
Explanation:
The speed of a wave is given by the wave equation:
[tex]v=f\lambda[/tex]
where
v is the speed
f is the frequency of the wave
[tex]\lambda[/tex] is the wavelength
In this problem, we have a wave with wavelength [tex]\lambda[/tex] and initial frequency
[tex]f_1 = 300 Hz[/tex]
So its speed can be written as
[tex]v_1 = f_1 \lambda = 300 \lambda[/tex]
Later, its frequency changes to
[tex]f_2 = 400 Hz[/tex]
Assuming that its wavelength has not changed, this means that its new speed is
[tex]v_2 = f_2 \lambda = 400 \lambda[/tex]
By calculating the ratio between the two,
[tex]\frac{v_1}{v_2}=\frac{3}{4}[/tex]
So, the ratio between initial and final speed is 3:4.
Learn more about waves:
brainly.com/question/5354733
brainly.com/question/9077368
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