Please Help!! Please dont write in cursive, I cant read cursive! please write ne
ID: 1577968 • Letter: P
Question
Please Help!! Please dont write in cursive, I cant read cursive! please write neat!!The Speed of Light
All the waves in the electromagnetic wave spectrum travel at the speed of light. Therefore, we can use a microwave oven to determine the speed of light.
Material
chocolate bars
microwave oven
ruler
paper towels or regular printer paper (nothing that can start burning in the micro wave oven!)
Preparation
Check the microwave oven to find the frequency at which it operates and note this number. Hint: The number is usually given in MHz = Mega hertz = 106 Hertz = 106 1/s
Take the chocolate bars from the wrapping and lay them next to each other so that they span almost the width of the microwave oven
If there is a pattern on one side, turn this side up-side-down so that you have a smooth surface.
Place the chocolate on some paper.
Remove the turn table from the microwave oven.
Place the chocolate in the microwave oven.
Procedure
Turn the microwave oven on for 5 seconds and check if some spots started to melt.
Repeat if there is no or only one single melting spot.
Remove the chocolate carefully from the microwave oven and place it on a flat surface.
Measure the distances between neighboring molten spots.
NOTE: It does not take long to melt the entire chocolate. Be careful and do not set it for longer than 5 second intervals. Watch carefully to catch it at a point with separate distinct molten spots.
Analysis
The microwave oven uses standing microwaves to heat food. The greatest intensity of the waves is in the anti-nodes of the standing wave, whereas the least intensity is in the nodes.
The chocolate will melt at places that correspond to the anti-nodes.
answer the questtions below: 9, 10, 11, 12
Q9. What are the individual distances between neighboring spots and what is their average value? Multiplying this distance with 2 gives you the wavelength of the microwave. How big is this wavelength?
Q10. What is the frequency at which your microwave oven operates?
Q11. The speed of the microwave is calculated as frequency times wavelength. What is your result for the speed of light? What is the acknowledged value for the speed of light? What is the difference between your measurement and the acknowledged value?
Q12. Why do most microwave ovens have turn tables
Explanation / Answer
this is an experiment to be carried out, the typical results comes as(varies with different ovens)
9) 6cm, wavelength=12cm
10)2,450 MHz
11)speed of light= 2450x10^6 x 0.12=2.94x10^8 m/s
12) for uniformity in cooking