Convert 6500 A to meters then to cm.
Then c = fw
c is speed of light in m/s
f = frequency in Hz
w = wavelength in m
Post your work if you get stuck.
An optical filter passes only far red light with an average wavelength of 6500 Å. (1 Å = 10-10 m). Calculate
(a) the wavelength in centimeters.
(b) the frequency.
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