Question

Calculate the speed of a wave having wavelength of 200 nm and frequency of 100 MHz.
(1) 2 m/s (3) 20 m/s
(2) 20000 m/s (4) 200 m/s

Answer 1

Answer:

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Answer 2

Answer:

(3) 20 m/s

Explanation:

Since options are given in m/s we should convert the respective units.

i.e, MHz to Hz and nm to m     .

100 MHz= 100 x 10^6  Hz

200 nm = 200 x 10^(-9) m

speed = frequency x wavelength

v = νλ

= 100 x 10^6  Hz x 200 x 10^(-9) m

= 20 m/s