Answers

2015-03-26T18:29:17+05:30
WKT 
v=n * lambda
v=1.5km/s = 1500m/s
wave length = 4mHz =4 000 000 Hz = 4x 10^{6} Hz
n= 1500/ 4x 10^{6}
= 3.75 x 10^{-4}  m
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