alleryA photon has wavelength $400\,nm$. Its frequency is approximately
A$7.5 \times 10^{14}\,Hz$
B$7.5 \times 10^{12}\,Hz$
C$4.0 \times 10^{16}\,Hz$
D$1.3 \times 10^{6}\,Hz$
Answer & Solution
Correct answer: A. $7.5 \times 10^{14}\,Hz$
$\nu = c/\lambda = (3 \times 10^{8})/(400 \times 10^{-9}) = 7.5 \times 10^{14}\,Hz$.
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