need help with these trick astronomy questions?

Question

3. Which of the following waves have the longest wavelength?

a. ultraviolet

b. visible green

c. visible red

d. gamma

4. Which of the following waves have the highest frequency?

a. radio

b. visible yellow

c. infrared

d. ultraviolet

Answer 1

The only trick question is yours in trying to get us to do your homework.

Answer 2

Although I agree with Mastermind that these questions are not by any means 'trick' questions, I do not agree with Mastermind's responses.

You just need to learn that wavelength and frequency are directly opposed to each other: the longer a wavelength, the lower its frequency, and the shorter a wavelenght, the higher its frequency. Otherwise, frequency and wavelength are measurements of the exact same things: waves:

In the visible spectrum, violet has a higher frequency and a shorter wavelenght than red.

Then, all you have to do (all? really!), is to learn where in relation to the colors of visible light fall such electromagnetic waves as infrared (beyond red), ultra violet (beyond violet), typical radio frequencies, and such things as gamma rays.

I do not believe Mastermind's answer of B for 3, "visible green" will qualify as either the shortest or the longest wavelenght as visible green falls between ultraviolet and visible red, which I know because Green is one of the middle colors of a rainbow, so B is the least likely to be correct answer.

The same is true for B, 'visible yellow' being the easiest to rule out of question 4.

Back to question 3, the question becomes whether or not visible red or gama waves are longer, and for that, we should consult an EM spectra chart.

http://images.google.com/imgres?imgurl=http://www.nasa.gov/centers/langley/images/content/114284main_EM_Spectrum500.jpg&imgrefurl=http://www.nasa.gov/centers/langley/science/FIRST.html&h=317&w=500&sz=67&tbnid=6VN-zkKvE-3F3M:&tbnh=82&tbnw=130&prev=/images%3Fq%3Delectromagnetic%2Bwaves%26um%3D1&start=2&sa=X&oi=images&ct=image&cd=2 suggests that C, Visible Red, is the correct answer for question 3, and that D, Ultraviolet, is the correct answer for question 4.

Answer 3

For all electromagnetic waves, the frequency is the inverse of the wavelenght (because they all travel at the speed of light which is, itself, an electromagnetic wave).

c = F*L
c = speed of light in m/s (let's say)
F = frequency in Hz (cycles per second)
L = Wavelength in m per cycle.

c is constant (299,792,458 m/s). Therefore, if you have a higher frequency, you must have a shorter wavelength.

The order can be found at
http://en.wikipedia.org/wiki/Electromagnetic_spectrum

see the table on the right side.

Answer 4

Visible red
ultraviolet

Answer 5

Your teacher is probably monitoring Yahoo!Answers to see if you are getting your homework answers here.

The longest wavelength is visible red, and the highest frequency is ultraviolet.

Now I feel terrible. I helped you cheat!

Answer 6

Those aren't trick questions. They are pretty straight foraward.

3.) B
4.) D

Answer 7

You'd better study your book...because you haven't got the correct answers yet.