Question

(Lambda, Hertz) _____ is the unit of frequency, and just means how many cycles per second. It is abbreviated as $Hz$ .

Answer 1

Hint:
Here we have to learn about frequency first.
We also have to see what will be the unit of frequency.

Complete step by step answer:
Frequency is the number of events per unit of time of a repeated case. It is often referred to as temporal frequency, where the difference between spatial and angular frequency is stressed. The frequency is measured in hertz units, which is equal to one repetitive incident per second.
It can also be said as the rate at which current direction changes per second.
Wave frequency is the number of waves that in a given amount of time travel through a fixed location.
Time period is the time in which an event takes to pass through one cycle.
Time period can also be said as the reciprocal of frequency.
The SI unit of frequency is hertz $(Hz)$ , named after Heinrich Hertz, the German physicist. One hertz means that once every second, an event occurs. This unit’s previous name was cycles per second.
The SI unit of time period is second.
The angular frequency typically denoted by the Greek letter $\omega $ is defined as the rate of change of the angular displacement or the rate of change of the sinusoidal waveform process or as the rate of change of the sine function argument.
Frequency has an opposite relationship to the wavelength for periodic waves in non-dispersive media. The frequency $f$ of a sinusoidal wave also in dispersive media is equal to the phase velocity $v$ of the wave separated by the wavelength $\lambda $ of the wave.
Hence, from the above discussion we can conclude that-
Hertz is the unit of frequency, and just means how many cycles per second. It is abbreviated as $Hz$ .

Note:
We should always remember that frequency and angular frequency are different and their units are not the same as well.
Time period is the time in which an event takes to pass through one cycle.