4D: Light and Sound

Question 1

What is the relation between density and velocity?

Answer 1

inverse

sound velocity= √(Κ/ρ)

Question 2

What is the range for visible light?

Answer 2

• ROYGBIV, 10^15 Hz

- 400 to 750 nm

Question 3

When does total internal reflection occur?

Answer 3

Light must travel from high index of refraction to a low index

Question 4

(T/F) Angle of incidence equals angle of reflection

Answer 4

true

Question 5

(T/F) Frequency of wave is not affected by medium through which it propagates

Answer 5

true

-wavelength changes

Question 6

What kind of lenses are needed for myopia and hyperopia?

Answer 6

myopia-diverging lens

hyperopia-converging lens

Question 7

blue shift vs red shift

Answer 7

blue shift-object approaching (perceived wavelength bigger than actual wavelength)
red shift-object receding (actual wavelength increase)

Question 8

What does focal length depend on?

Answer 8

radius of curvature (f=R/2)

Question 9

visible light range

Answer 9

• 400 nm to 700 nm

- complementary colors: red/green; orange/blue; yellow/purple

Question 10

light bounding off boundary

Answer 10

reflection

Question 11

light bending as passing medium (glass prism example)

Answer 11

refraction

Question 12

splitting light by frequency

Answer 12

dispersion

Question 13

spreading of light when encountering an edge

Answer 13

diffraction

Question 14

converging lens (concave/convex) and diverging lens (concave/convex)

Answer 14

converging lens= convex

diverging lens= concave

Question 15

standing wave equation

Answer 15

wavelength= 2L/n; frequency= nv/2L; (n=1,2,3)

Question 16

open and closed pipe equation

Answer 16

open: wavelength= 2L/n; frequency= nv/2L; (n=1,2,3)
closed: wavelength= 4L/n; frequency= nv/4L; (n=1,3,5)

Question 17

convex mirrors form virtual/real images

Answer 17

virtual upright images