Topic 4 Waves Flashcards

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1
Q

Q – What is frequency defined as?

A

A – the no. of waves per second

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2
Q

Q – 3 waves measure 18m long. What is the wavelength?

A

A – 6m

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3
Q

Q – as light enters a glass block from air it will refract. What happens to the wavelength and speed of the light?

A

A – the wavelength and speed of the light will decrease.

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4
Q

Q – Give 3 examples of a Transverse wave

A

A – any of the EM waves

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5
Q

Q – What 4 possible things might a wave do if it hit a surface?

A

A – Transmit / Absorb / Reflect / Refract.

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6
Q

Q – Give an example of a longitudinal wave

A

A – Sound

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7
Q

Q – what equation is used to calculate wave speed?

A

A – Wave speed = frequency x wavelength

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8
Q

Q – Waves carry energy and not matter. What does this mean?

A

A – the particles only vibrate as they pass the energy on. They don’t actually move through the wave.

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9
Q

Q – if we doubled the frequency of a wave then what would happen to its wavelength?

A

A – it would half.

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10
Q

Q – How do we define a Transverse wave?

A

A – the particles vibrate at 90 degrees to the direction of the wave.

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11
Q

Q – A man is playing a note on a flute. The amplitude of the note then increases. How would the sound change?

A

A – it would get louder.

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12
Q

Q – How do you calculate the frequency of a wave if you know the time period?

A

A – Frequency = 1 / Time period

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13
Q

Q – as light enters a glass block from air it will refract. What happens to the wavelength and speed of the light?

A

A – the wavelength and speed of the light will decrease.

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14
Q

Q – which type of waves will speed up as they travel into a more dense medium

A

A – longitudinal waves – (sound or P-waves)

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