Aparticular am radio station broadcasts at a frequency of 1020 kilohertz. what is the wavelength of this electromagnetic radiation?
1 m
how much time is required for the radiation to propagate from the broadcasting antenna to a radio 3 km away?
2 s

Explanation:

Given that,

Frequency of the AM radio station,

(a) Let is the wavelength of this electromagnetic radiation. It can be calculated as :

Since the wavelength of one cycle is 294.12 m, then the total number of cycles over a 3 km distance is:

Let the period is the duration of one cycle is given by:

So, total time required is t as :

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

hi there!

out of the two, (b) precision would be more reasonable.   however, both a and b could be pretty reasonable.

-awesomerepublic   : )