Transcript LightWaveReviewAnswerKey

PART A
VENN Diagrams
1.
Mechanical Waves
Electromagnetic
Waves
Require a medium to
travel
Two types:
Transverse waves
Longitudinal waves
Types of waves
Can travel without
a medium
Travel through
empty space
(vacuum)
Transverse
2.
Waves
Waves move the
medium at a right
angle compared to
the direction in which
the waves travel
Wave moves L to R
Medium moves up
and down
Longitudinal
Waves
Types of
mechanical
waves
Move the medium
in the same
direction as the
wave
3.
Medium
Vacuum
Empty space
Material
through which a
mechanical
wave travels
Where waves
travel
Through which
electromagnetic
waves travel
PART B
Diagrams and Calculations
1. Wave Diagram
2. Wave Analysis
a)
b)
c)
d)
e)
f)
g)
Wave A
Wave B
3 mm
1 cm
8 Waves
3 Waves
Wave B
3. a) Wave Calculations
G: Speed = 15cm/s, wavelength = 5 cm
R: Frequency = ?
A: Frequency = speed / wavelength
S: Frequency = 15cm/s / 5 cm
S: Frequency = 3 Hz
3. b) Wave Calculations
G: Frequency = 8 Hz, wavelength = 8 cm
R: Speed = ?
A: Speed = wavelength  frequency
S : Speed = 8 cm  8 Hz
S: Speed = 64 cm/s
4. Wavestown
Radio - Microwave - Infrared -Visible Light - UV - X-Ray -Gamma EXAMPLES WILL VARY
PART C SHORT ANSWER
a)
b)
c)
d)
Visible Light
Wavelength
Visible, Infrared, Microwave, Radio
Really Messy Insects View Ugly Xbox
Games
PART A
VENN Diagrams
1.
Reflection
Bouncing back of
a wave when it
hits a surface it
cannot pass
through
Refraction
Properties of light
Bending of
waves as they
enter a new
medium at an
angle
2. Near-sightedness
Far-sightedness
Can only see
things that are
closer
Can only see
things that are
farther away
Eye is too long
front to back
Eye is too short
front to back
Focal point is in
front of the retina
Correct using a
concave lens
Both problems
can be corrected
with lenses.
Focal point is
beyond the retina
Correct using a
convex lens
3.
Optical Axis
An imaginary
line that
divides a mirror
in half
Focal Point
Part of a light
diagram
Point where
light rays meet
after being
reflected or
refracted
PART B
Diagrams
1.
QuickTime™ and a
TIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and a
TIFF (Uncompressed) decompressor
are needed to see this picture.
Farsightedness can be
corrected with a convex
lens.
Nearsightedness can be
corrected with a concave
lens.
The lens makes the light
converge more, so it
focuses on the retina.
The lens makes the light
diverge more, so it focuses
on the retina.
2. When white light (such as sunlight) hits a yellow ball…
- The yellow light will reflect off the ball.
- All other colors of light besides yellow will be
absorbed by the ball.
yellow light
The ball looks
yellow because
that is the only
color of light
reflected off the
ball.
3.
Reflection/Refraction Practice
4. Mirror
8. Lens
5. Reflection
9. Refraction
6. Convex
10. Concave
7. See diagram
11. See diagram
Reflection/Refraction Practice
12. Mirror
16. Lens
13. Reflection
17. Refraction
14. Concave
18. Convex
15. See diagram
19. See diagram
17.
18.
20
21
IR
N
IR
AI
AR
60 °
°
30Ό
60
AI
RR
AR
45 °
45Ό
23
20.
IR
RR
N
AR
30 °
30
AI
45
°
19.
22
RR
N
N
AI
AR
0°
°
IR
0°
RR
60Ό
21.
N
22.
IR
N
IR
10Ό
AI
80 °
°
AI AR
10° 10° RR
AR
80
RR
80Ό
PART C
Short Answer Questions
1. The Law of Reflection states that the
angle of incidence is always equal to
the angle of reflection.
2. A material’s index of refraction is a
measure of how much light will bend
as it travels from one medium to
another.
3. Blue, green and red. White.
4. Diffuse Reflection = when rays of light
hit a rough surface and all reflect at
different angles - an unclear reflection is
created
Smooth Reflection = when rays of light
hit a smooth surface - a sharp reflection
is created
Human Eye Diagram
A. Ciliary Muscles
B. Lens
C. Cornea
D. Pupil
E. Iris
G. Optic Nerve
H. Retina
Remember to study …
-
in a quiet area
when you are well rested
and not hungry
without your iphone, ipod, Internet
Good luck on Monday!