<rt id="wogsm"></rt><center id="wogsm"></center>
<center id="wogsm"></center>
<optgroup id="wogsm"></optgroup>
<center id="wogsm"></center><center id="wogsm"></center>
You are using an outdated browser. Please upgrade your browser to improve your experience and security.
Question: A large loudspeaker is called a tweeter.
Answer: A large loudspeaker is called a woofer. It helps produce low-frequency notes at a high quality.
Question: A small loudspeaker is called a tweeter.
Answer: A small speaker is called a tweeter. It is used to produce sounds at high frequencies.
Question: The world’s biggest radio telescope is made of aluminum.
Answer: The 1,000 foot (305-meter) dish of the Arecibo Observatory’s radio telescope, in Puerto Rico, is made of 40,000 perforated aluminum sheets.
Question: Sound travels faster than light.
Answer: The speed of sound is 346 meters per second. The speed of light is 299,792.458 kilometers per second.
Question: An antenna can only pick up radio waves.
Answer: An antenna is needed to transmit (send) and receive radio waves (electromagnetic field signals). Antennas are sized to match the length of the wave they are sending or receiving.
Question: Cellular phones use relayed radio signals.
Answer: Cellular phones make radio connect with the nearest tower, or cell, and make contact with the other callers’ phones through a series of electrical and sometimes optical connections.
Question: Parabolic antennas are painted white to look nice.
Answer: Parabolic antennas are painted white to deflect heat from the sun. If they absorbed that heat, the metal in the bowls might deform, distorting the radio waves.
Question: Radio astronomy is called that because astronomers listen to the radio for UFOs.
Answer: Radio astronomy involves the reception and study of radio energy, which travels great distances across the universe. Quasars and pulsars were discovered by radio astronomy.
radio. Old analog electric radio with speaker, knobs and tuner. transmission, radio wave
? Photos.com/Thinkstock

Acoustics and Radio Technology: Fact or Fiction?

{{(vm.state.currentQuestion + 1)}} of {{vm.questions.length}}
Acoustics and Radio Technology: Fact or Fiction?
You finished!
Your Score: {{vm.state.numberCorrect}} / {{vm.questions.length}}
Play Next Quiz
{{(vm.state.currentQuestion + 1)}} of {{vm.questions.length}}
{{vm.state.numberCorrect}}/{{vm.questions.length}} correct
{{vm.state.score|number:0}}/{{vm.maxPoints}} points
Your results
Question {{($index + 1)}}
Your Answer:
{{vm.state.responses[$index].isCorrect ? 'Your' : ''}} Correct Answer:
Are you a quizmaster?
Compare your score
Max Score: {{vm.maxPoints}}
Your Score
Community Average
High scores
or to track your quiz stats, save your best scores, and compete with the community!
Check out Britannica's new site for parents!
Subscribe Today!