Question

What is a unit of wavelength?
A. Hertz
B. Meter
C. Meter per second
D. second

Answer 1

Hint: Find quantity whose unit is hertz, meter, meter per second, second. Learn the definition of wavelength and try to find its unit and then match with given options. Learn the units of distance. Draw a diagram and show wavelength in that diagram.

Complete step by step answer:
The wavelength is the spatial period of a periodic wave – the distance over which the wave’s shape repeats. It is the distance between consecutive corresponding points of the same phase on the wave, such as two adjacent crests, troughs.
Wavelength is commonly denoted by Greek letter lambda (λ).
Hence, wavelength measures distance between two consecutive crests or troughs and the unit of distance is meter. So option B is correct.

Additional Information:

Frequency is the number of occurrences of a repeating event per unit of time. Frequency is measured in units of hertz (Hz) which is equal to one occurrence of a repeating event per second.

Note: Students should note that the knowledge of units of all the quantities is very much important. Students should remember S.I units, MKS units as well as CGS units of all the quantities. If it is difficult to remember then find out the formula by which its unit can be derived.