Answer:
So percentage error will be 2 %
Explanation:
We have given initial value of acceleration due to gravity
And final value of acceleration due to gravity
We have to find the percentage error
We know that percentage error is given by
So %
A certain FM radio station broadcasts electromagnetic waves at a frequency of 60,500,000 Hz. These waves travel at a velocity of
300,000,000 m/s. What is the wavelength of these radio waves?
A. 4.96 m
B.0.2 m
C. 360,500,000 m
A. 4.96 m
B.0.2 m
C. 360,500,000 m
1 answer:
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Answer:
B.) by interfering with sound waves
Explanation:
As we know that the interference of sound waves is of two types
1). constructive interference
2). destructive interference
now we know that constructive interference means the resultant intensity will be more than the intensity of interfering waves as here two waves are in same phase.
In destructive interference the resultant of two waves is given by the minimum resultant of the intensity as here the phase of two waves are opposite to each other.
So we will say that
here in case of noise cancelling headphones we know that the phase of noise is always made in opposite phase with the sound which is used to cancelled the noise.
This will reduce the noise and we will get a clear sound
