Question

1. __________ is when sound, technically called audio, is sent over the airwaves through transmitters to thousands of listeners.

a. televising
b. simulcasting
c) broadcasting
d. recording

1. __________ and __________ are two things that radio waves are used in.

a. lan phones and microwaves
b. computers and calculators
c. none of these
d. police radar detectors and radio - controlled model aircraft

1. digital signals ________ sound waves into a series of numbers. (6 letters)
2. a ___________ is used to turn sound waves into an electrical signal for recording or amplification.

a) microphone
b. head set
c. sound board
d. none of these

1. a tape recorder is both _________ and ________ device.

a. a limited and dynamic
b) an input and output
c. an input and recording
d. a listening and output

Explanation:

• Question 4: Broadcasting is the process of sending audio (sound) over the airwaves through transmitters to a large number of listeners. Televising involves visual and audio, simulcasting is simultaneous broadcasting on multiple channels, and recording is storing sound.
• Question 5: Radio waves are used in police radar detectors (to measure speed) and radio - controlled model aircraft (for control). LAN phones use local area network technology, microwaves are a different part of the electromagnetic spectrum (shorter wavelength than radio waves), and computers and calculators have various components but not primarily radio - wave - based in the context of the question.
• Question 6: Digital signals convert sound waves into a series of numbers. This is a fundamental concept in digital audio processing.
• Question 7: A microphone is a device that turns sound waves (mechanical energy) into an electrical signal (electrical energy) for recording or amplification. A headset is for listening and sometimes speaking (but not just the conversion part), and a sound board is for mixing and processing audio signals.
• Question 8: A tape recorder can take in an audio signal (input) and play back an audio signal (output). It is not just about recording (as it can play back) and not about limited/dynamic in the context of input - output.

Answer:

1. C. Broadcasting
2. D. Police radar detectors and Radio - controlled model aircraft
3. Convert
4. A. Microphone
5. B. an input and output