Question

The time required for the passage of one wavelength is the:

Answer 1

Time may be measured in seconds

If you look at all the features of a wave

its period, amplitude, frequency, wavelength, phase

WHICH of those is measured in seconds?

Anything measured in something else (e.g. metres, metres/s etc) CANNOT be the answer.

Answer 2

Frequency is the measure of how many wave crests pass a fixed point in a second.

Answer 3

@Supernova_Sonntag The OP asks for the inverse of that - how long for 1 wavelength to pass...
(Please don't post the direct answer)

Answer 4

@MrNood

My apologies.