Question

(a)
2.
The diagrams below show the patterns produced on an oscilloscope by three
different sound waves.
M
А
B
с
(0)
Which two waves have the same loudness?
Write the letters.
and

Answer 1

Because it has to be that way

Answer 2

In the diagram attached, the option that shows the two waves have the same loudness is option A and C.

What is the statement about?

Note that in the diagram The letters may be in either order and both the letter and the correct explanation are need for the marking of the  their amplitudes as they are the same.

Therefore, In the diagram attached, the option that shows the two waves have the same loudness is option A and C.

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