[DPMT 2002]
A) 9 x 1013 cycles/sec
B) 1015 cycles/sec
C) 90 cycles/sec
D) 3000 cycles/sec
Correct Answer: B
$ \nu =\frac{c}{\lambda }=\frac{3\times 10^{8}}{3000\times {{10}^{-10}}}=10^{15} $ cycles/sec
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