Question

Which is measured in hertz?
(A) Frequency
(B) Amplitude
(C) Period
(D) Wavelength
(E) Kinetic Energy

Answer 1

Hint:One hertz is equal to one cycle per second or one complete wave per second. Find for which there will be cycles and waves and cross check whether their units are hertz or not.

Complete step by step answer:
Frequency is the ratio of no. of cycles travelled per unit time or the number of occurrences per unit time. The units of frequency are hertz. As 1 hertz is equal to one cycle per second.
$1hertz=1cycle/second$
Amplitude is the maximum displacement of the waves or the distance from rest to crest and is measured in meters or centimeters or millimeters.
Period is also known as time period. Time period is the reciprocal of frequency. As the frequency increases, the time period decreases. The units of Time period are seconds/cycle or $Hert{z}^{-1}$.
Wavelength is the length of one complete wave cycle. The units of wavelength are meters or centimeters or millimeters.Kinetic Energy of an object is the energy it possesses due to its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy. Kinetic Energy (KE) is ${\displaystyle \frac{1}{2}}m{v}^2$ where m is the mass of the object and v is the velocity of the object. The units of KE are joules.
Therefore, the Option A is correct as the unit of Frequency is Hertz.

Note: In physics, units are standards for measurement of physical quantities that need definitions to be useful. There are two types of units, English units and S.I. units. S.I. units are a metric system of units.