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P6: Quiz 7 – Answers
P6: Quiz 7 – Answers
1) Electric, magnetic fields
Electromagnetic (EM) waves are made up of oscillating ELECTRIC and MAGNETIC FIELDS.
2) A transmitter produces a radio wave when an alternating current passes through an aerial. The AC supply causes the charges in the transmitter to oscillate which produces an electric and magnetic field – this is our radio wave. The frequency of the radio wave produced will be equal to the frequency of the AC supply. The wave produced will travel through the atmosphere.
Some of these radio waves will reach a second aerial where they will be absorbed by the electrons; the second aerial is known as the receiver. The energy that is absorbed by the electrons in the receiver causes the electrons to oscillate at the same frequency as the transmitter. If the receiver is part of a complete circuit, the oscillating electrons will produce an AC current with the same frequency as the transmitter.
3) Yes, because the long-waved radio waves can bend/ diffract around the earth’s surface
4)
a) The ionosphere is an electrically charged layer of the earth’s upper atmosphere
b) Yes, because the short-waved radio waves can reflect off of the ionosphere
5)
a) Any 3 from Bluetooth, wifi, TV or FM radio
b) No, because very short-waved radio waves will not diffract around hills and they will not travel far through buildings
Electromagnetic (EM) waves are made up of oscillating ELECTRIC and MAGNETIC FIELDS.
2) A transmitter produces a radio wave when an alternating current passes through an aerial. The AC supply causes the charges in the transmitter to oscillate which produces an electric and magnetic field – this is our radio wave. The frequency of the radio wave produced will be equal to the frequency of the AC supply. The wave produced will travel through the atmosphere.
Some of these radio waves will reach a second aerial where they will be absorbed by the electrons; the second aerial is known as the receiver. The energy that is absorbed by the electrons in the receiver causes the electrons to oscillate at the same frequency as the transmitter. If the receiver is part of a complete circuit, the oscillating electrons will produce an AC current with the same frequency as the transmitter.
3) Yes, because the long-waved radio waves can bend/ diffract around the earth’s surface
4)
a) The ionosphere is an electrically charged layer of the earth’s upper atmosphere
b) Yes, because the short-waved radio waves can reflect off of the ionosphere
5)
a) Any 3 from Bluetooth, wifi, TV or FM radio
b) No, because very short-waved radio waves will not diffract around hills and they will not travel far through buildings
Questions
1) Fill in the gaps in the sentence below.
Electromagnetic (EM) waves are made up of oscillating ______ and ______ ______.
2) Explain how radio waves are produced by a transmitter and received by a receiver.
3) Can long-waved radio waves be received if the receiver is not in sight of the transmitter? Explain your answer.
4)
a) What is the ionosphere?
b) Can short-waved radio waves be received if the receiver is not in sight of the transmitter? Explain your answer.
5)
a) Give 3 examples of very short-waved radio waves.
b) Can very short-waved radio waves be received if the receiver is not in sight of the transmitter? Explain your answer.
1) Fill in the gaps in the sentence below.
Electromagnetic (EM) waves are made up of oscillating ______ and ______ ______.
2) Explain how radio waves are produced by a transmitter and received by a receiver.
3) Can long-waved radio waves be received if the receiver is not in sight of the transmitter? Explain your answer.
4)
a) What is the ionosphere?
b) Can short-waved radio waves be received if the receiver is not in sight of the transmitter? Explain your answer.
5)
a) Give 3 examples of very short-waved radio waves.
b) Can very short-waved radio waves be received if the receiver is not in sight of the transmitter? Explain your answer.