Step 1:

(a)

The cathode-ray oscilloscope (CRO) is a common laboratory instrument that provides accurate time and amplitude measurements of voltage signals over a wide range of frequencies.

Its reliability, stability, and ease of operation make it suitable as a general purpose laboratory instrument.

The heart of the CRO is a cathode-ray tube.

(b)

A time base generator, or timebase, is a special type of function generator, an electronic circuit that generates a varying voltage to produce a particular waveform .

Time base generators produce very high frequencysawtooth waves specifically designed to deflect the beam in cathode ray tube (CRT) smoothly across the face of the tube and then return it to its starting position.

(c)

A digital signal is a physical signal that is a representation of a sequence of discrete values for example of an arbitrary bit stream , or of a digitizedanalog signal..

Radio is the radiation wireless transmission of electromagnetic energy through space^. The biggest use of radio waves is to carry information, such as sound, by systematically changing (modulation) some property of the radiated waves, such as their amplitude , frequency,phase, or pulse width

In digital electronic switching the discrete or digital wave forms are used.

In Transmission of radio signals magnetic waves are used.

(8.4)

The Oscilloscope displays a sine wave having $\"\"$ vertical divisions and $\"\"$ horizontal divisions.