A. 1.2 s
B. 1.0 s
C. 0.5 s
D. 0.1 s
Correct Answer:
Option D = 0.1 s
Explanation
V = fλ
f = (v)/λ = (420)/42 = 10 HZ
Period, T = (1)/F = (1)/10 = 0.1 secs
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