Wondering if someone can please explain why this question is unsound; Given that v= frequency x lambda and the frequency of a wave under investigation is 15Ghz with a wavelength of 0.2m, select the correct answer below.

a. v= 7.5 x 10^1 0 m/s
b. None of these answers are correct.
c. v= 1.3 x 10^-11 m/s
d. The question is unsound.
e. v= 3x10^9 m/s

Why are graphs useful when interpreting data

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

How does a circuit breaker protect a refrigerator? a. when the current is too high, a metal strip in the fuse melts and opens the circuit. b. when the resistance is too high , a re-settable which opens a circuit c. when the current is too high , a re-settable switch opens the circuit d. when the resistance is too high a metal strip in the fuse melts and opens the circuit