Q.1.
In AM waves what remains constant?
Q.2.
Which waves pass through the atmosphere and they are not reflected back toward Earth?
Q.3.
What is orbiting Earth that receive radio, television, and telephone signals and then transmit them around the world?
Q.4.
What is faster the speed of light or the speed of sound?
Q.5.
What are points on a standing wave where the amplitude of the wave is zero?
Q.6.
What are crests and troughs of a standing wave?
Q.7.
What types of waves do cell phones use?
Q.8.
How can cell phones make long distance calls?
Q.9.
How do FM waves travel?
Q.10.
What waves carry information to your TV and radio ?
Q.11.
What relays signals it receives from Earth back to other receivers?
Q.12.
What must radio waves move around? Select the best answer
Q.13.
Which theory was confirmed by the discovery of Heinrich Hertz?
Q.14.
It is an intense burst of radio-frequency energy lasting for a fraction of a second.
Q.15.
In what part of the transmitter did Hertz see electrical sparks?
Q.16.
Which of the following is the SI unit for frequency?
Q.17.
Which of the following sparks can produce radio waves?
Q.18.
Heinrich Hertz was a famous physicist widely known for his discovery of what?
Q.19.
Hertz (Hz) is an SI unit for which of the following measurement?
Q.20.
True or False: PSAP’s who are close in geographical proximity are usually assigned different frequencies so they can avoid interference