Question

please answer it right now i need it

Imagine a 1 km long railway tunnel. At one end P of this tunnel, is a CD player playing songs. At the other end Q, are two sensitive recorders R1 and R2 which can record sound of even very low volume.
R1 receives the sound through the air in the tunnel and R2 through the steel rail. Both recorders are on all the time.
A song begins playing at P beginning at 10.00 and ends at 10.03. If we compare the recordings R1 and R2, we would find that ________________.
1R1 will play the song slower2R2 will play the song slower3the start of recording in R1 will be later than in R24the start of recording in R2 will be later than in R1
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Answer 1

Answer:

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