Abeam of light has 600 nm what is the frequency

if the wavelength is observed in vacuum.

Step-by-step explanation:

,

where

in vacuum and in the earth atmosphere. However, the value of will be smaller in other media.

.

.

.

One [oscillation] in each second is the same as one Hertz . In other words, .

.

not sure but it may be b, as i said i'm not sure.

60

step-by-step explanation:

every triangle measures a total of 120 degrees. you have to find angle c. we know that isosceles triangles angles are equal. 60 degrees plus 60 degrees gives you 120.