Lesson 3

Frequency and Wavelength

Review Questions

N5D01 What is the name of a current that flows only in one direction?

• A. An alternating current
• B. A direct current
• C. A normal current
• D. A smooth current

N5D04 Which of the following will produce a direct current (DC)?

• A. A NiCd battery
• B. An RF signal generator
• C. A commercial generating station
• D. A crystal calibrator

N5D03 What is the name of a current that flows back and forth, first in one direction, then in the opposite direction?

• A. An alternating current
• B. A direct current
• C. A rough current
• D. A steady state current

N5D02 Which of the following will produce an alternating current (AC)?

• A. A lead-acid automotive battery
• B. A solar array
• C. A fuel cell
• D. A commercial generating station

N5D05 What term means the number of times per second that an alternating current flows back and forth?

• A. Pulse rate
• B. Speed
• C. Wavelength
• D. Frequency

N5D06 What is the basic unit of frequency?

• A. The hertz
• B. The watt
• C. The ampere
• D. The ohm

N5D12 What does 60 hertz (Hz) mean?

• A. 6000 cycles per second
• B. 60 cycles per second
• C. 6000 meters per second
• D. 60 meters per second

N5D07 Most humans can hear sounds in what frequency range?

• A. 0 - 20 Hz
• B. 20 - 20,000 Hz
• C. 200 - 200,000 Hz
• D. 10,000 - 30,000 Hz

N5D08 Why do we call electrical signals in the frequency range of 20 Hz to 20,000 Hz audio frequencies?

• A. Because the human ear cannot sense anything in this range
• B. Because the human ear can sense sounds in this range
• C. Because this range is too low for radio energy
• D. Because the human ear can sense radio waves in this range

N5D09 What is the lowest frequency of electrical energy that is usually known as a radio frequency?

• A. 20 Hz
• B. 2,000 Hz
• C. 20,000 Hz
• D. 1,000,000 Hz

N5D13 What is the name for the distance an AC signal travels during one complete cycle?

• A. Wave speed
• B. Waveform
• C. Wavelength
• D. Wave spread

N5D14 What happens to a signal's wavelength as its frequency increases?

• A. It gets shorter
• B. It gets longer
• C. It stays the same
• D. It disappears

N5D15 What happens to a signal's frequency as its wavelength gets longer?

• A. It goes down
• B. It goes up
• C. It stays the same
• D. It disappears

Table of Contents

Lesson 3 - Frequency and Wavelength

Review Questions

Answers

aa0ni@yahoo.com

Daniel Reynolds - AA0NI - July 11, 1998