S.I. unit of wavelength of a wave is:-
Metre
Watt
Joule
Kilogram
S.I. unit of wavelength of a wave is metres (m) because wavelength is the distance (length) between two consecutive crests and troughs on a wave.
The commercial unit of energy is :
(a) watt
(b) watt-hour
(c) kilowatt-hour
(d) kilo-joule
Which of the following unit is not a fundamental unit :
(a) metre (b) litre
(c) second (d) kilogram.