physics - light & sound

Question 1

what happens to light rays in a concave lens?

Answer 1

the rays diverge away from each other

Question 2

what happens to light rays in a convex lens?

Answer 2

the rays converge towards each other

Question 3

what are the 7 colours in a spectrum?

Answer 3

red, orange, yellow, green, blue, indigo, violet (ROYGBIV)

Question 4

what are the 3 primary colours in light?

Answer 4

red, blue, and green

Question 5

what is the speed of light?

Answer 5

300,000,000 metres per second

Question 6

what is the normal?

Answer 6

the normal is perpendicular to the surface (90°)

Question 7

how does light travel?

Answer 7

in waves and straight lines

Question 8

define refraction

Answer 8

refraction is where light bends

Question 9

define transparent, translucent, and opaque

Answer 9

transparent-you can see clearly through
translucent-you can see through partially
opaque-you can’t see through at all

Question 10

define amplitude

Answer 10

how much energy a wave has, or how loud/quiet it is. measured in metres

Question 11

define frequency

Answer 11

the number of waves that pass a point in 1 second. measured in Hertz (Hz)

Question 12

noise levels?

Answer 12

measured in decibels (dB) using a decibel meter