Physics 2

Question 1

Speed of light

Answer 1

c= 3.0 x 10^8 m/s in a vacuum

depends if the medium in which it’s travelling
slows down in more dense mediums

Question 2

optical density (n)

Answer 2

n= c vacuum/ c substance

Question 3

Light

Answer 3

Electromagnetic waves that stimulate the retina of the eye. Lightwaves have a wavelength from 400nm to 700 nm. (1x 10^-9 m)

Question 4

Colours of light (visible )

Answer 4

white light

Question 5

Primary Colours of Light

Answer 5

Red
Blue
Green

Question 6

Secondary Colours Of Light

Answer 6

Yellow —> red and green
Cyan —> blue and green
Magenta —> red and blue

Question 7

What makes white

Answer 7

red + blue + green

Question 8

Shadows

Answer 8

Formed whenever an opaque object blocks the path of light

Question 9

what changes in position of the object produce a sharper shadow?

Question 10

what produces a larger shadow

Question 11

what produces a larger penumbra

Question 12

Reflection of Light

Answer 12

pencil ——> }
of ——> } ray
light ——> }

Question 13

Speculation Reflector

Answer 13

bounces at same angle
look at notes for pic

Question 14

Diffuse angle

Answer 14

different angles
look at notes for pic

Question 15

Line of Sight

Answer 15

Has to do with two eyes
Assuming close range with two eyes

<• - - _ _ _
— •
<• __——- /

Question 16

Parallax

Answer 16

long distances
apparent motion of 2 stationary objects when the observer moves