Question

to prove that b is equal to N Lambda

Answer 1

Hyyyyy mate

this is your answer

$we \:k now \: that \\ v = \frac{distance}{time} \\ \: \: \: \: = \: \: \: \: \frac{ lamda}{t} \\{ \frac{1}{t} = f} \\ v = lamdaf$
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