16. Wavelength of light of frequency 100 Hz ?
(a) \( 2 \times 10^6 \, \text{m} \)
(b) \( 3 \times 10^6 \, \text{m} \)
(c) \( 4 \times 10^6 \, \text{m} \)
(d) \( 5 \times 10^6 \, \text{m} \)
Answer : (b) \( 3 \times 10^6 \, \text{m} \)
\( \lambda = \frac{100}{3 \times 10^8} = 3 \times 10^6 \, \text{m} \)
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