Answer :
Final answer:
The audible limits for a swept-tone signal that a human can hear range from 20 Hz to 20,000 Hz, matching the normal human hearing range.
Explanation:
The question pertains to the audible limits of an Amplitude Modulated (AM) continuous downward swept-tone signal within human hearing range. The human ear can detect sounds in a range from about 20 Hz to 20,000 Hz. Sounds below 20 Hz are termed infrasound and those above 20,000 Hz are termed ultrasound. Therefore, the correct option for the audible limits of this swept-tone signal is 20 Hz to 20,000 Hz.
