Radio Waves and Electromagnetic Fields

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16 Νοε 2013 (πριν από 3 χρόνια και 4 μήνες)

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Radio Waves and Electromagnetic Fields

AP physics


April
25
, 2012

Answer all qu
estions in your composition book. Describe completely. How does the signal get from one
place to another? How does this describe radio waves? Do you know about other waves as well? Be
ready to define all terms.

Go to
http://phet.colorado.edu/en/simulatio
n/radio
-
waves

(use the link on the class website.) Find
“physics” and then find
“light and radiation.” Select
“Radio waves and electromagnetic fields.” Run
now.”

1.

Wiggle the electron. What do you see?

2.

When the electron is vibrating, does it accelerate? Defe
nd your answer.

3.

Why does this send a signal through space?

4.

What do all electromagnetic waves have in common?

Research and find out.

5.

What makes these different from mechanical waves?

6.

What happens to the electrons on the antenna on your house? Propose an exp
lanation.

7.

Now stop. Select “oscillate.” Describe what you see.

8.

How is the wave pattern different now?

9.

Why do you think the antenna at your house vibrates more vigorously now?

10.

N
ow change the amplitude.
Increase, then decrease.
What is different now?

11.

What do

you suppose the word “amplitude” means? Propose a definition.

12.

Does the amplitude seem to affect the
speed

of the wave? Explain.

13.

Now change the frequency of the wave. Describe what you see.

14.

How is “frequency” different from “amplitude.”

15.

How is it possible
that a high frequency wave can have the sam
e speed as a low frequency
wave?

16.

How is the electron on the antenna of the house affected by the el
ectron on the radio station
an
ten
na?

17.

Why are these electrons a bit out of phase?

18.

On the other hand, how could it b
e possible to listen to a baseball game on the radio and still
hear the crack of the bat before someone sitting in the cheap seats at the stadium?

(This
actually DOES occur. Propose an explanation.)

19.

How is it that we are really looking back in time when we

view the night sky?

Think about this


what do you see? When was it produced?

20.

How did the energy from the sun get to the beads and cause the color change? How is this a bit
like what you see here?

Is this a bit like what happens when your SKIN is exposed
to the sun and
changes color? Defend your answer.

21.

Why do we say that ALL waves transmit energy, but not matter?

Research and find out.

How
does this apply to what you saw today.

22.

Summary


what IS a wave? Propose a definition. Go ahead and do research to
see what you
find. Post on the blog


due Monday, April 30
th



midnight.