How many frequencies combine to produce a tone in a telephone?
A)Three
B)Two
C)Five
D)Six

Question

Quizplus · Accepted Answer

Two frequencies combine to produce a tone in a telephone.
Key Takeaway: The tones in a telephone like the dial tone, common dialing sounds, busy, and off-hook, are recorded sounds embedded on a chip on the telephone's circuitry. The dial tone is a combination of 350 Hz tone with a 440 Hz tone. A busy signal is a combination of a 480 Hz tone and a 620 Hz tone that is cycled on and off.

How Many Frequencies Combine to Produce a Tone in a Telephone