Physics test 3 grade 10

Question 1

G (giga)

Answer 1

billion or 10^9

Question 2

M (mega)

Answer 2

Million 10^6

Question 3

k (kilo)

Answer 3

thousand 10^3

Question 4

d (deci)

Answer 4

tenth 10^-1

Question 5

c (centi)

Answer 5

hundredth 10^-2

Question 6

M (milli)

Answer 6

thousandth 10^-3

Question 7

µ (micro)

Answer 7

millionth 10^-6

Question 8

n (nano)

Answer 8

billionth 10^-6

Question 9

scientific notation

Answer 9

number x 10^ something
add as many zeros as the exponent to the right of the number
if exponent is negative, add zeros to the left of the number

Question 10

Transverse waves and example
(4)

Answer 10

carry energy
is the result of an up and down motion
oscillations (movements) are at a right angle to the direction of travel
example would be light waves

Question 11

Longitudinal waves (4)

Answer 11

to and fro movements are in the same direction as the direction of travel
section where waves are bunched up are compressions
section where waves are stretched out is called rarefaction
example includes sound waves

Question 12

speed of waves is measured in

Answer 12

m/s

Question 13

frequency is measured in

Answer 13

hertz or (Hz)

Question 14

the time for one oscillation is called ____ and is measured by

Answer 14

the period, 1 / frequency

Question 15

wavelength

Answer 15

the distance between any point on a wave and the equivalent point on the next
measured in meters λ

Question 16

amplitude

Answer 16

the max distance a point moves from its rest position when a wave passes

Question 17

wave equation

Answer 17

speed = frequency x wavelength
V = f x 𝞴
m/s = Hz x m

triangle = v
λ x f

Question 18

crest/peak

Answer 18

the top part of the wave

Question 19

trough

Answer 19

the bottom part of wave

Question 20

when two waves travel towards each other one on top and one on the bottom what happens when they meet

Answer 20

they create a straight line

Question 21

when two waves travel towards each other on the same side what happens when they meet

Answer 21

the width doesnt change, but the amplitude doubles

Question 22

time period and frequency

Answer 22

time period = 1/frequency
frequency = 1/time period

Question 23

speed of sound

Answer 23

343 m/s

Question 24

speed of light

Answer 24

300 000 000 m/s

Question 25

when are electromagnetic waves emitted

Answer 25

when charged particles oscillate or lose energy in some way

Question 26

relationship between energy, frequency, and wavelength

Answer 26

higher the frequency, greater the energy, shorter the wavelength

Question 27

With reference to the electromagnetic spectrum and human actions explain why some people might say that ‘mobile phones cook your brain’

Answer 27

Some people might say that mobile phones ‘cook your brain’, because of the technology they have inside them. Since the technology has the same heating effect as microwave ovens for example, people are concerned that the microwaves that phones emit will heat up (or cook) our organs. Since phones are used for phone calls and are generally held near our head, some people’s concern is that they will damage our brain.

Question 28

features of electromagnetic waves (4)

Answer 28

travel through vacuum all have a speed of 300 000 000 m/s all transverse waves all transfer energy (lose energy when radiates these waves, gains energy when absorbs these waves_

Question 29

Radio waves (4)

Answer 29

average wavelength of 10 m can be as long as a football pitch longest wavelength and least amount of energy used for long distance radio, local radio, tv, phones, satellites, wifi, mocrowave ovens

Question 30

Infrared (2)

Answer 30

average wavelength of 10^-4 radiant heaters and grills, tv remote controllers, security alarms, lamps,

Question 31

visible light (3)

Answer 31

10^-6 ish only type of radiation visible to the eye sunlight

Question 32

ultraviolet (2)

Answer 32

10^-8 causes tanning, skin cancer, eye damage, kills bacteria, and causes fluorescence

Question 33

x rays (2)

Answer 33

around 10^-10 used for x rays, photography, causes cancer but can also kill cancer cells

Question 34

gamma rays (5)

Answer 34

around 10^-13 emitted by radioactive materials uses and effects as for x rays used for sterilizing medical quipment and food shortest wavelength and most energy

Question 35

order of electromagnetic spectrum from longest wavelength/least energy to shortest wavelength/highest energy

Answer 35

radio waves, infrared, visible light, ultraviolet, x rays, gamma rays

Question 36

mechanical waves

Answer 36

disturbance in matter that transfers energy through the matter requires a medium to pass through looses energy as it travels

Question 37

what do electromagnetic waves consist of

Answer 37

vibrating electric and megnetic fields

Question 38

Up to what temperature are infrared waves produced (and not visible light)?

Answer 38

At around 700 degrees C , infrared becomes visible light

Question 39

What detector and emitter of these waves might you be carrying?

Answer 39

Microwaves are used in mobile phones

Question 40

How does the x-ray behave when it encounters different parts of the body?

Answer 40

Long wavelength X - rays can penetrate through flesh, but not bone, allowing us to get imaging of the bones. The dark areas are flesh and white areas are bone. All X - rays are dangerous as they harm living cells in our bodies, causing mutations or cancer. Interestingly, concentrated beams of X - rays can be used to treat cancer as well. In terms of reduction, doctors wear lead vests, and depending on the injury, some patients will too.

Question 41

Types of mechanical waves

Answer 41

transverse, longitudinal, and surface waves (combination)

Question 42

how will electromagnetic waves interact with matter

Answer 42

reflect, refract, or diffract