Waves

Question 1

what is a wave?

Answer 1

a wave is a vibration/oscillation which transfers energy without transferring any matter by making the particles of substances it is travelling through vibrate

Question 2

wave diagram

Answer 2

Question 3

for sound waves what does a high amplitude mean?

Answer 3

high amplitude = loud sound

Question 4

what does low amplitude mean for sound waves?

Answer 4

low amplitude = quiet sound

Question 5

what would frequency be for aerobic respiration?

Answer 5

low frequency

Question 6

what would frequency be for anaerobic respiration?

Answer 6

high frequency

Question 7

What is frequency?

Answer 7

the number of complete waves passing a certain point every second

Question 8

what is frequency measured in?

Answer 8

Hertz - Hz

Question 9

What is period (time) for waves?

Answer 9

the time it takes for one complete wave to pass

Question 10

how to calculate period?

Answer 10

p (time in seconds) = 1/f (frequency in hertz)

Question 11

how to calculate speed?

Answer 11

v (speed in m/s) = λ (wavelength in m) × f (frequency in hertz)

Question 12

what is a transverse wave?

Answer 12

waves in which the vibrations go 90° to the direction of energy transfer of the wave eg. EM waves.

Question 13

what is a longitudinal wave?

Answer 13

waves in which the vibration is parallel to the direction of energy transfer

Question 14

electromagnetic spectrum

Answer 14

Question 15

gamma rays uses

Answer 15

radiotherapy cancer treatment:
-destroys cancer cells
-needs correct does
-precise area
Irradiation
-food stays fresher

Question 16

x-rays uses

Answer 16

detect broken bone:
-absorbed by bones (white parts)
-easily pass through skin/tissue (black parts)

Question 17

UV ray uses

Answer 17

tanning
detecting hidden marks:
-mark items with UV pen (invisible ink)
-shine UV
-ink absorbs UV and reflects visible light

Question 18

microwave uses

Answer 18

heating food:
-absorbs by water molecules
-molecules vibrate —> heat energy
satellite signals:
-easily pass through atmosphere

Question 19

what are things that happen to waves when they reach a boundary?

Answer 19

-absorbed (material becomes hot)
-reflect (mirror)
-transmit (pass through)
-refracts (bends)

Question 20

why does refraction happen?

Answer 20

when waves change speed and direction when passing from one medium to another eg. from air to water

Question 21

refraction diagram

Answer 21

Question 22

wavy water surface

Answer 22

diffused reflections as wave is hitting wavy surface at different angles