1
Q
Electromagnetic hyperlearning
A
2
Q
Electromagnetic waves are transverse waves that travel at the same speed in a vacuum. To simplify things, we assume that the speed of EM waves in air is the same as that in a vacuum.
A
3
Q
There is a continuous spectrum of EM waves. EM waves transfer energy from the source of the wave to an absorber of the wave and this depends on two factors:
Frequency.
Wavelength.
A
4
Q
What type of wave are electromagnetic waves?
A
Transverse
Physics
flashcards
Decks in class (20)
# Cards
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Give one reason why an electromagnet would be used rather than a permanent magnet.48
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Describe how the students could build an electromagnet. Include in your answer how the students should vary and test the strength of their electromagnet.26
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2 (a) There is an alternating current in the primary coil of the transformer. State what is produced in the iron core.0
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(1)A transformer has only one turn of wire on the secondary coil. The potential difference across the secondary coil is 11.5 V The potential difference across the primary coil is 230 V0
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(2)Calculate the number of turns on the primary coil.0
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In most transformers, the power output is less than the power input. State why.0
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State the resolution of the voltmeter. Give one reason why the resolution of the voltmeter is suitable for this investigation0
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Both students recorded their results correctly. Give the reason why student 2 got different results from student 1.0
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The students decided that even though the results were different, there was no need to repeat the investigation. How do the results show that the investigation is reproducible?0
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State the name of the process which causes the potential difference to be produced in this investigation.0
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A transformer has been developed that can be used with many different devices. Suggest one advantage of having a transformer that can be used with many different devices.0
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Ultrasound is used to scan unborn babies but X-rays are not used to scan unborn babies. Explain why.0
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The behaviour of ultrasound waves when they meet a boundary between two different materials is used to produce an image. Describe how.0
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The closest distance between the unborn baby and the mother’s skin is 4.0 cm. calculate the average speed of the pulse.0
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Describe how X-rays are able to produce an image of bones0
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X-rays are able to produce detailed images because their wavelength is very ________________________ .0
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Which one of the following pairs of angles correctly identifies the angle of incidence and the angle of refraction?9
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The glass used to make this optical fibre has a refractive index of 1.5. Calculate the critical angle of the glass. Give your answer to 2 significant figures0
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Electromagnet4
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*Currents1
