Topic 2 - Waves

Question 1

What is a pulse?

Answer 1

A single wave

Question 2

What is the amplitude of a wave?

Answer 2

The distance from the median line and the crest/trough of the wave

Question 3

What is a pulse?

Answer 3

A single wave

Question 4

What is amplitude?

Answer 4

The distance from the middle of the wave to the crest/trough

Question 5

What is the wavelength?

Answer 5

Distance to complete 1 repetition

Question 6

T or F: λ represents wavelength?

Answer 6

True

Question 7

T or F: Frequency is the amount of seconds it takes for 1 repetition?

Answer 7

False

Question 8

What is the unit for frequency?

Answer 8

Hertz

Question 9

What is frequency?

Answer 9

The number of waves per second

Question 10

T or F: Period is the time taken for 1 repetition?

Answer 10

True

Question 11

What is the symbol for period?

Answer 11

T

Question 12

What is the equation for period?

Answer 12

T = 1/F

Question 13

How do you find the speed of a wave?

Answer 13

V = F(frequency) x λ (wavelength)

Question 14

T or F: Intensity is the same as impulse?

Answer 14

False

Question 15

What is the equation for Intensity?

Answer 15

I = W / r(distance)^2

Question 16

What does intensity measure?

Answer 16

Power over area

Question 17

What is the distance between transverse and longitudinal waves?

Answer 17

Transverse are an object moving, longitudinal are compressions of air.

Question 18

T or F: Talking uses longitudinal waves?

Answer 18

True

Question 19

When a rope/wave is fixed to a wall, what will the wave do when it hits the wall?

Answer 19

Reflect

Question 20

T or F: A wave will stay the same when hitting a wall without being secured?

Answer 20

True

Question 21

If a rope changes from light to heavy, will any of the wave be reflected?

Answer 21

Yes

Question 22

If a heavy rope changes from heavy to light, what will the velocity do?

Answer 22

Increase

Question 23

What is the law of reflection?

Answer 23

I (incidence) = R (reflection)

Question 24

What is refraction?

Answer 24

The lengthening /shortening of wavelengths based on medians

Question 25

If a wave travels into a denser medium, will the wavelengths increase or decrease?

Answer 25

Decrease

Question 26

T or F: A wave passing passes into a lighter median, it will refract toward the normal?

Answer 26

False

Question 27

What is diffraction?

Answer 27

spreading of waves through gaps

Question 28

If a wavelength is equal to a gap, will it diffract?

Answer 28

Yes

Question 29

T of F: A gap bigger than the wavelength will result in large diffraction

Answer 29

False

Question 30

What is the difference between constructive and destructive superposition?

Answer 30

Constructive is 2 waves on the same plane resulting in a larger wave, destructive is 2 waves on different planes resulting in smaller or no waves

Question 31

What is the equation for destructive superposition?

Answer 31

(n + 0.5) x λ

Question 32

T or F: Nλ tells if the superposition will be constructive

Answer 32

True

Question 33

What is an antinode?

Answer 33

The extreme points of a wave

Question 34

T or F: A node is the middle points of a wave?

Answer 34

True

Question 35

What is the fundamental frequency?

Answer 35

the smallest frequency

Question 36

What is the equation for wavelengths with pipes/strings closed at both ends?

Answer 36

λ = (2 x L) / n

Question 37

What does n stand for in λ = (2 x L) / n

Answer 37

Number of harmonics/frequencies

Question 38

How do you find frequency for a string/pipe fixed at both ends?

Answer 38

F = (n x V) / (2 x L)

Question 39

How do you calculate the frequency of light?

Answer 39

F = C / λ

Question 40

What does c mean in light?

Answer 40

Speed of light

Question 41

What is the speed of light?

Answer 41

~ 3 x 10^8

Question 42

What is the visible range for light in frequencies?

Answer 42

400 x 10^12 - 800 x 10^12

Question 43

T or F: A light wave with wavelength 800nm could be seen by the human eye?

Answer 43

False

Question 44

What is the visible range of light with wavelengths?

Answer 44

790nm - 390nm

Question 45

How many lines do you draw to create a ray diagram?

Answer 45

2

Question 46

Where do the 2 lines go for a ray diagram?

Answer 46

1 perpendicular to the object until it touches the mirror/lense, 2 straight through the focal point then perpendicular to mirror/lense

Question 47

How far is the focal point?

Answer 47

0.5 x Centre

Question 48

How can you find the refractive index?

Answer 48

Sin i / sin r = v1 / v2 = λ1 / λ2 = n2 / n1 = index

Question 49

What does the critical angle indicate?

Answer 49

Total internal reflection

Question 50

What is the equation for the critical angle?

Answer 50

Sin (ic) = n2/n1