Light waves are electromagnetic waves that travel at 3.00 108 m/s. the eye is most sensitive to light having a wavelength of 5.50 10-7 m. (a) find the frequency of this light wave. hz (b) find its period. s

(a)

Explanation:

The relationship between wavelength, frequency and speed of an electromagnetic wave is:

where v is the speed, f is the frequency, is the wavelength.

For the light wave in the problem, we have:

is the speed of light

is the wavelength

Substituting these numbers into the equation, and re-arranging it, we find the frequency of the light wave:

(b)

Explanation:

The period of a wave is equal to the reciprocal of the frequency:

where f is the frequency of the wave, which we found in the previous part of the exercise. Substituting, we find:

b mirrors submit a iisner? e. for which optical devices does d sometimes have a positive value? o a a and b o b. a and c o c. b and d 0 d. b and cb

force tends to be low and long diustance masses are high