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What is Physics Good For?

Warming up on... Electromagnetic Radiation

This assignment is due before 9 AM, Wednesday, October 24^th, 2007.

Please type your last name and first initial (e.g., Rader, A):

Please type a nickname: (in case your answer gets used in class).

The following questions refer to the material you were to read in preparation to the lesson. Please write a three or four sentence response to each of the questions.

You may change your mind as often as you wish. When you are satisfied with your responses, click the SUBMIT HOMEWORK button at the bottom of this page.

WarmUp questions are worth 4 points.

1.

Put these forms of radiation in order of increasing frequency: red light, x-rays, yellow light, microwaves, gamma rays.

2.

Estimate the wavelength of your favorite radio station.

3.
Light from the Sun reaches the Earth's atmosphere at a rate of about 1350 W/m². Assuming that this light is entirely absorbed, estimate the force exerted on the Earth due to radiation pressure. Is this significant compared to the force on Earth due to the Sun's gravitational attraction?

Below is a space for your thoughts, including general comments about today's assignment. What was hard or confusing (or cool)? What would you like to spend extra time on in class? Do you see how this subject fits in with the others we have discussed?

You may change your mind as often as you wish. When you are satisfied with your responses click the SUBMIT button.

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This assignment is due before 9 AM, Wednesday, October 24th, 2007.

1.

2.

3.

This assignment is due before 9 AM, Wednesday, October 24^th, 2007.