Answer: 3.54 x 10^10Hz
Explanation:
Given that:
wavelength = 8.45 mm
Since unit of wavelength is metres, convert 8.45 millimeters to metres
(If 1000mm = 1m
8.45mm = 8.45/1000 = 8.45 x 10^-3m)
Wave speed (c) = 2.99 x 10^8 m/s
Frequency of the infrared wave = ?
Now apply the formula
wavespeed = frequency x wavelength
i.e C = F λ
Where F = C / λ
F = 2.99 x 10^8 m/s / 8.45 x 10^-3m
F = 3.54 x 10^10Hz
Thus, the frequency of this infrared wave is
3.54 x 10^10 Hertz
