Show:
Waves
Refraction
Diffraction
Properties of Light
Trivia
100
What equation relates frequency to velocity?
v = fh
100
State Snell's law

n1sin(x1) = n2sin(x2)

100
What is diffraction?
Waves bending around an object
100
What is the order of the colors in a rainbow?
Roy G Biv

Red, orange, yellow, green, blue, indigo, violet

100
Wub-a-lubba-dub-____
Dub!
200
Find the frequency of a wave traveling 20 m/s with a wavelength of 3 m. Include your units!
6.67 Hz
200
If a wave travels into a denser medium, what happens to its wavelength?
The wavelength decreases
200
Why is it easier for sound waves to bend around objects than for light waves to bend around objects?
Larger wavelengths bend easier around similarly sized objects
200

How can we prove that light behaves like a wave?

Diffraction. Science, yo!

200
What is my favorite physics equation?
F = ma
300
Which travels faster - a radio wave or a light wave?
The same! They're both electromagnetic
300
A wave that travels from water to air bends toward/away from the normal
Away

(FST = fast to slow, toward normal)

(SFA = slow to fast, away normal)

300

Light passes through 2 slits 0.3 mm apart onto a screen. What is the wavelength of light if the angle to m=2 is 0.209 degrees?

Bonus - double points - What color light is this?

dsin(x) = mh

0.0003sin(0.209) = 2h

h = 547 nm [Green Light]

300
What causes rainbows to form?
Light refracting through denser materials. Different wavelengths of light bend slightly differently and separate
300
If vampires can't see their reflection, what does that mean about them, scientifically speaking?
Light must reflect off of them, or else we couldn't see them. There is no answer because frickin vampires aren't frickin real. Any convincing argument will suffice.
400
A sound wave has a period of 0.5 seconds. What is its wavelength?
171.5 m
400
A laser travels through air into glass. Find the index of refraction of glass if the incident angle is 20 degrees and the refracted angle is 32 degrees.

nr = 1.65

400

Light passes through 2 slits 0.3 mm apart onto a screen 2.61 m away. What is the wavelength of light if the distance from the central bright fringe to m=2 is 12 mm?

Bonus - double points - What color light is this?

dsin(x) = mh

0.0003sin(x) = 2h

tan(x) = y/L    arctan(0.012/2.61) = 0.263

0.0003sin(0.263) = 2h

h = 690 nm [Red Light]

400

Find the energy of a green light wave of wavelength 500 nm.

E = fh

v = f * wavelength

f = 6E14

E = 6E14 * 6.626E-34 = 3.98E-19 J

400
If the sun suddenly disappeared, how long would it take for us to notice?
It takes light ~8 minutes to reach us, so approximately 8 minutes.
500
Two waves of amplitude 5m meet and constructively interfere. How high is the resulting crest?
10m
500
A green laser travels through air and enter glass (index 1.4) at 15 degrees. It exits the glass into water (index 1.33). What is the angle of refraction?
sin(15) = 1.4sin(x)  x = 10.6 degrees


1.4sin(1.6) = 1.33sin(y)  y = 11.2 degrees

500

Light passes through 2 slits 0.1 mm apart producing an interference pattern on a screen 1.2 m away. If the λ of light is 500 nm, how far from the center of the screen is the second order bright fringe?

dsin(x) = mh

0.0001sin(x) = 2(500E-9)

x = 0.57 degrees

tan(x) = y/L tan(0.57) = y/1.2

y = 0.012 m or 12 mm

500
What are the wavelengths of violet and red light, respectively?
Violet range: 380 - 450 nm

Red range: 620 - 750 nm

500
What are my kids' names?
Alyce & Dean