A6.53 ! 1014 hz electromagnetic wave propagates in carbon tetrachloride with a speed of 2) 2.05 ! 108 m/s.

the wavelength of the wave in vacuum is closest to:

a) 413 nm

b) 368 nm

c) 505 nm

d) 459 nm

e) 314 nm

E) 314 nm

Explanation:

The relationship between speed, frequency and wavelength for an electromagnetic wave is given as:

                         V = fλ

Where;

V is the speed of the wave

f is the frequency of the wave

λ is the wavelength.

Making λ the subject of the equation,

                       λ = V/ f

                       λ = 2.05 x 10^8 / 6.53 x 10^14

                          = 3.14 x 10^-7 m

                         = 314 x 10^-9 m

                         = 314 nm

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

neither accurate nor precise.