Topics 6-8 Wave Theory Test Study

Question 1

Magenta absorbs what color? (light mixing wise)

Answer 1

Green

Question 2

Cyan absorbs what color? (light mixing wise)

Answer 2

Red

Question 3

Yellow absorbs what color? (light mixing wise)

Answer 3

Blue

Question 4

What are the three primary colors in additive color mixing?

Answer 4

Red Green and Blue

Question 5

What are the secondary colors in additive color mixing?

Answer 5

Cyan Magenta and Yellow

Question 6

What is the difference between additive and subtractive in colour mixing?

Answer 6

additive colour mixing is mixing/combining light, subtractive colour mixing is mixing paints or inks

Question 7

What was Isaac Newton’s real accomplishment/discovery about light?

Answer 7

That he recombined the colours (turning them back to white light) (using prisms)

Question 8

What is the the order according to length of waves of the electromagnetic spectrum. (including the visible spectrum ROYGBIV)

Answer 8

1) Infrared –
some wave lengths detected as heat

2) Ultraviolet –
a range of wavelengths (eg. UV A and UV B)

3) Xrays (pass through tissue but not bone)
4) Radio waves (including microwaves)

5) Gamma –
given off in nuclear reactions and used to treat cancers

Question 9

What do waves do as they get shorter?

Answer 9

They decrease wavelength and increase frequency

Question 10

What are the parts of a wave?

Answer 10

crest, trough, amplitude, wavelength

(Frequency (Hz or cycles per second)

Question 11

What do rod and cone cells detect?

Answer 11

Light (ROYGBIV)

Question 12

What do rod and cone cells detect?

Answer 12

Light (ROYGBIV) ((colour))

Question 13

3 Primary colours create _______ ________?

additive colour mixing wise

Answer 13

white light

Question 14

Two secondary colours create white light because…?

12 words

Answer 14

all three primary colours are present in making any two secondary colours.

Question 15

What is a nanometer?

Answer 15

A nanometer (nm) is equal to 0.000 000 001 m.

Expressed in scientific notation, this is 1.0 x 10^-9 m.

Red light has a wavelength of 700nm or 0.000 000 7 m
(7.0 x 10^-7 m). The nanometer is so tiny that about 500 000 of them would fit across the thickness of a sheet of paper.

Question 16

What is scientific notation?

Answer 16

Scientific notationis the way that scientists easily handle very large numbers or very
small numbers.

Forexample, instead of writing 0.0000000056, we write 5.6 x 10 -9 .
5 600 000 000.00 , we write 5.6 x 10 9 .

200 000.0 we write 2.0 x 10 5 .
0.00002 we write 2.0 x 10 -5 .

Question 17

How do you convert numbers to scientific notation?

Answer 17

To convert any number into scientific notation, you write the non-zero digits, placing a decimal after the first non-zero digit. Then, you count the number of digits you need to move the beginning decimal to get to where your decimal is now. If you move the decimal to the left, then your power is positive.

Question 18

What are coherent and incoherent waves?

Answer 18

Coherent sources are sources of light that emit waves which have zero or constant phase difference and same frequency.

(ex. Only a beam of laser light will not spread and diffuse. In lasers, waves are identical and in phase, which produces a beam of coherent light.)

Incoherent sources are sources of light that emit waves which have random frequencies and phase differences.

Question 19

What are fibre optics?

Answer 19

A optical fibre is designed to reflect light so that it is piped through the length of the fibre without escaping, except at the ends.
(pg.246)