physics - lesson 1

Question 1

bioluminescence + 1 example

Answer 1

chemiluminescence that occurs in living organisms, fireflies

Question 2

incandescence+ 1 example

Answer 2

the process of producing light as a result of a very high temperature, incandescent light bulbs or molten lava glowing

Question 3

fluorescence + 1 example

Answer 3

when an object absorbs ultraviolet light and immediately releases it, laundry detergent making clothes brighter, highlighters

Question 4

phosphorescence + 1 example

Answer 4

Light produced by phosphors. Phosphors absorb light energy. They keep some and release the rest. Glow in the dark effect (ex. glow in the dark stickers)

Question 5

chemiluminescence + 1 example

Answer 5

light produced as a result of a chemical reaction, almost no heat is produced, ex. glowsticks

Question 6

triboluminescence + 1 example

Answer 6

production of light when certain crystals are rubbed, crushed, or scratched, ex. rubbing two quartz crystals produces light

Question 7

electric discharge + 1 example

Answer 7

light produced by an electric current passing through a gas, ex. neon signs (electricity passing through various gases including neon to produce a coloured light)

Question 8

what kind of wave does light travel as

Answer 8

transverse

Question 9

describing waves: four parts of a wave

Answer 9

1. crest: the highest point on the wave
2. trough: the lowest point on the wave
3. amplitude (a): the distance between the axis of symmetry of the wave and the crest/trought
4. wavelength (λ): the length of one full wave

Question 10

frequency meaning in terms of wavelength

Answer 10

the number of waves that pass in 1 second

Question 11

How would you calculate frequency when you know the time taken for 1 cycle to pass in seconds?

Answer 11

F=1/T

Question 12

define dispersion

Answer 12

the seperation of visible light into its different colours

Question 13

explain dispersion (do not define)

Answer 13

when white light passes through a prism, it is separated into its component colours (red, orange, yellow, green, blue, indigo, violet)

Question 14

Explain the visible light spectrum. which colour has the highest frequencey? Which has the lowest?)

Answer 14

red is lowest (least energy), violet is highest (most energy)

Question 15

1 use radio wavelengths

Answer 15

ultrasounds

Question 16

1 use microwave wavelengths

Answer 16

cooking or remote sensing

Question 17

1 use infrared wavelengths

Answer 17

heat sensing/night vision equipment

Question 18

1 use visible wavelengths

Answer 18

seeing, laser points

Question 19

1 use ultraviolet wavelengths

Answer 19

killing bactera, suntanning

Question 20

1 use X-ray wavelenghts

Answer 20

viewing bones and organs

Question 21

1 use gamma wavelengths

Answer 21

cancer screening, tumour removal

Question 22

electromagnetic spectrum: order wavelengths from longest to shortest (7)

Answer 22

radio, microwave, infrared, visible, ultraviolet, xray, gamma (RMIVUXG)