Karl listed the steps involved when information is sent from transmitters to receivers.1 - A signal is produced. 2 - Radio waves are modulated and amplified. 3 - An antenna sends modulated waves through the air. 4 - An antenna captures the modulated waves. 5 - A signal is heard, seen, or used.
Answer
A
After Step 5, radio waves are amplified and demodulated.
B
Before Step 5, radio waves are amplified and demodulated.
C
After Step 3, radio waves are amplified and demodulated.
D
Before Step 3, radio waves are amplified and demodulated.
Explanation
After the receiving antenna captures the modulated radio waves in Step 4, the receiver amplifies and demodulates them to recover the original information. That recovered signal can then be heard, seen, or used in Step 5. So amplification and demodulation happen before Step 5, as stated in choice B.
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