P5 Questions Flashcards

1
Q

water and water waves

A

Water particles move up + down
Water particles move 90 degrees to the direction of the wave
Energy moves in the direction of the wave

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2
Q

How to measure speed of sound in air

A
  • produce sound and receive by a receiver
  • measure distance between source and microphone
  • measure time between sound played on speaker and heard by receiver
  • calc speed = d/t
  • repeat + avg
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3
Q

Ultrasound positives + negatives

A
Ultrasound show:
- SOFT tissue, 
-kidneys,
-blood flow
- good for prenatal scans 
- Safe 
 Ultrasound is only reflected by soft tissue - bone is not shown
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4
Q

X-Rays positives + negatives

A
  • show bone (absorbed by bone) = can save lives by identifying these problems

Damage, ionise living cells, can cause cancer + damage foetus
- high frequency but SMALL wavelengths to penetrate body

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