Question

can boost weak signals, which are then easily heard from the speakers.
a. a transmitter
b. an amplifier
c. a receiver
d. a transistor
the first forms of electronic communication were the ____ and ____.
a. telephone and morse code
b. telephone and transmitter
c. tablet and telegraph
d. telephone and telegraph
radio signals with high frequencies have ______ wavelengths. (5 letters)

Explanation:

• For the first question, an amplifier boosts weak signals. A transmitter sends signals, a receiver receives them, and a transistor is a semiconductor device.
• For the second question, the telephone (1876) and telegraph (1837) were early electronic communication forms. Morse Code is a code, a transmitter is a part of a system, and a tablet is not an early electronic communication form.
• For the third question, using the formula \(c = f\lambda\) (where \(c\) is the speed of light, \(f\) is frequency, and \(\lambda\) is wavelength), higher frequency (\(f\)) means shorter wavelength (\(\lambda\)) as \(c\) is constant.

Answer:

1. B. An amplifier
2. D. telephone and telegraph
3. short