Physics 3200: Heat, Light and Sound

Homework Assignment 9:  Due Wednesday, May 21? 

Turn in the Boldfaced Questions?

1.       What is the primary difference between infrared and visible light?

2.       Which color of light has the lowest frequency, blue or yellow?  Which has the longest wavelength?

3.       It takes 4 years for light to travel from the nearest star (other than our sun) to the earth.  How far away is the star in meters?  (One year is about 3.16×107s.)

4.       What three things can happen when electromagnetic waves strike something like a piece of glass?

5.       What is the primary thing that happens to visible light that strikes a mirror? 

6.       What is the primary thing that happens when visible light strikes glass? 

7.       What is the primary thing that happens when ultraviolet light strikes glass? 

8.       If white light shines on a dark grey surface, why might the surface warm up?

9.       Why do all stars appear white to the naked eye, even though some are bluish and some are reddish in color?

10.    The frequency of blue-green light is about 5.8x1014Hz.  What is its wavelength?

11.    What color(s) of light is/are transmitted through blue glass?

12.    What color(s) of light is/are absorbed by green paper?

13.    Why are red, green, and blue called the additive primary colors?

14.    When you look at a piece of yellow paper in a room where the room lights emit white light, why does the paper appear yellow?

15.    If I illuminate a piece of magenta paper with a blue laser and no other light, what color will the paper appear to be?  Why?  What will happen if I illuminate it with a green laser?

16.    What color will be transmitted through overlapping cyan and yellow filters? 

17.    If someone is wearing green clothing on a stage, what color(s) of light should they be illuminated with if you want their clothing to appear dark (almost black).

18.    If I illuminate a piece of white paper with yellow and blue light, what color will it appear to be?  Why?

19.    Why do sunsets appear to be somewhat red or orange in color?

20.    If you put cyan ink on a very red paper, i.e. the red is very saturated, what color will it look like?  Why?  What will happen if you use yellow ink?

 

 

Exam III is on Wednesday, May 14.  Bring a Large Bluebook

Formulas are on the reverse side

 

 

 

 

Formulas for Exam III

 

Change in Position = Final Position – Initial Position

 

 

 

 

 

            TKelvin = Tcentigrade + 273

frequency×wavelength = wave speed.

Frequency = 1/period

1Hz = 1cycle/s

fn = n(wave speed)/(2L)

fn = nf1

 

 

 

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New Formulas for the final

 

ROYGCBV

 

speed of light = 3x108m/s

C = G + B

Y = R + G

M = R + B