Light from a red laser pointer has a speed of 3.0×108 m/s and has a wavelength of 6.5×10−7 m . what is the frequency of this light?

Explanation:

We have equation for speed of electromagnetic wave,

               c = fλ

Where

           f is the frequency and λ is the wavelength.

Here

            c = 3.0×10⁸ m/s

            λ = 6.5×10⁻⁷ m

Substituting in c = fλ

              3.0×10⁸ = f x 6.5×10⁻⁷

               f = 4.61 x 10¹⁴ Hz

The frequency of this light is 4.61 x 10¹⁴ Hz

b.transmitters send radio waves, and receivers capture radio waves.

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.