5. Electromagnetic radiation travels at a speed of 3.0 x 10^8 m/s.
a) What is the wavelength of a radio wave that has a frequency of 3.5 x 10^5 Hz? b) What is the frequency of an X-ray that has a wavelength of 2.5 x 10^-10 m?

a=805714*10^2

b=1.2*10^18

Explanation:

a) v=lf

Where l is wavelength sorry can't draw it

3*100000000=l*350000

L=8. 5714*10^2

b) v=lf

300000000=0.00000000025f

f=1.2*10^18

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

it has to be b, about 97 percent.