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chapter 15 sound review answers.notebook
May 20, 2015
1. v=d/t
2. v=f*lambda
3. T=1/f
Beat freq= f2­f1
don't need this for test
331 m/s
3.00 x 108 m/s
2
Freq Longitudinal 1 Standing Waves 13 Decibels 5
Loudness 3 Doppler 8 Interference 7 Rarefaction 11
Compression 12 Hz 6 Pitch 4 Echo 9 Beats 10
Page 3
1.2 9. 4
2.2 10. 1
3. 3
4. 1
5. 4
6. 3
7.4
8.1
Mult Ch
1D
2 C
3E
4A
5B
6B
7A
8D
chapter 15 sound review answers.notebook
May 20, 2015
about 1000 meters
Doppler shift is shift in frequency and wavelength
that occurs when a source of waves is moving relative to an observer of the waves
chapter 15 sound review answers.notebook
May 20, 2015
Since the light from stars in other galaxies is Doppler shifted to lower frequencies, we infer the universe's rapid expansion.
This is referred to as Doppler "red­shift".
Red is lower
frequency
lower frequency
higher
frequency
Chapter 16 em spectrum start.notebook
May 20, 2015
Electromagnetic Waves (light) are a TRANSVERSE waves.
Electromagnetic Waves are created by vibrating charges
Chapter 16 em spectrum start.notebook
May 20, 2015
The Electromagnetic Spectrum
color of this?
Chapter 16 em spectrum start.notebook
Light is so ...................
In one second, it can go around the Earth 7.5 times!
speed
of
light
in a
vacuum
= c = 3.00 x 108 m/s
All types of electromagnetic radiation have the same speed in a vacuum
X­rays, Ultraviolet, gamma, infrared,
visible light, radio waves, microwaves
https://www.youtube.com/watch?v=Wp20Sc8qPeo&feature=relmfu
May 20, 2015
Chapter 16 em spectrum start.notebook
May 20, 2015
When light waves encounter a new medium,
there are 3 possibilities:
1) absorption 2) reflection 3) transmission
Absorption of light occurs due to the atoms' natural frequencies matching the frequency of light being absorbed. In a basic sense, the atoms' nuclei pick up the light's vibrational energy and that energy is now INTERNAL Energy (Q)
This is guy is getting HOT
Reflection occurs when the electrons on the outside of atoms can absorb the light but the nuclei don't have natural frequencies matching the light's frequency, so the electron re­emits the light back out.
Loosely held electrons are very efficient light reflectors. This is why
polished metals make good reflectors.
Chapter 16 em spectrum start.notebook
May 20, 2015
Transparent Material
Measuring the speed of light
Euclid and Plato
~300 BCE
Thought the act of seeing was active, not passive.
The notion was: That when you looked at something, invisible "filaments" emanated from your eyes!
Devised a method with lanterns on opposing mountains. Didn't work.
Galileo
1640
Ole Roemer
Used the variation of in the time
it took Io, a moon of Jupiter to transit behind Jupiter.
1676
First success!
Michelson
1900
Used a rotating mirror to
very precisely determine the amount of time it took
light to transit a measured distance.
Got the Nobel Prize in Physics!
Chapter 16 em spectrum start.notebook
May 20, 2015