Homework Help: Physics

Posted by Anonymous on Friday, April 18, 2008 at 1:55pm.

1)Put the types of radiation of the electromagnetic spectrum in order from:

a)longest to shortest wavelength
b)greatest to lowest energy
c)slowest to fastest speed

A)radio,microwave,infrared,light,x-rays,gamma rays

B)gamma-rays,infrared,light,microwave,radio

I couldnt find C. I got this from wiki,my book and another site

2)Put the following colors in order of smallest to largest frequency: blue,orange,green. Explain that logic for your order.

blue,green,orange don't understand this from a site:

"When a beam of white light (sunlight) is passed through a PRISM, as shown in figure 1-18, it is refracted and dispersed (the phenomenon is known as DISPERSION) into its component wavelengths. Each of these wavelengths causes a different reaction of the eye, which sees the various colors that compose the visible spectrum. The visible spectrum is recorded as a mixture of red, orange, yellow, green, blue, indigo, and violet. White light results when the PRIMARIES (red, green, and blue) are mixed"

Physics - DrBob222, Friday, April 18, 2008 at 2:23pm
1a is ok.
1b is ok.
1c. Isn't ALL electromagnetic radiation the speed, c, = 3 x 10^8 m/s.

2.The wavelengths of visible light are, in order of WAVELENGTH, longest wavelength is red and shortest wavelength is violet. This is also the order of lowest frequency to highest frequency.
red
orange
yellow
green
blue
violet
You can remember this very well with a mnemonic my physics prof taught me 60 years ago (if we include indigo as a color).
red
orange
yellow
green
blue
indigo
violet.
The first letters spell a man's name. His name is Roy G. Biv. :-)
Physics - Anonymous, Friday, April 18, 2008 at 2:57pm
1c)no thats the speed of light. to find the speed or whatever I would have to use this

v=f*w for each and put them in order from slow to fast
Physics - Anonymous, Friday, April 18, 2008 at 3:08pm
ok without the work, if A is correct then wouldnt it be the reverse for C? since the wavelength of A is from large to small then the smallest would then generate the lowest speed b/c v=frequency*wavelength? That REALLY makes since to me.
Physics - DrBob222, Friday, April 18, 2008 at 3:51pm
It doesn't make sense to me.
velocity (of light--no matter the color) = 3 x 10^8 m/s.
c = f*w. That's how you calculated frequency and wavelength. For long w, the f must be short. For short w, then f must be high because f*w=c, a constant. Scroll down on the site below to History, and read through that and/or go to www.google.com and type in color of violet light and look at some of the hits you will get. The speed of light is not the same in air or glass or water as it is in a vacuum but it is the same within a medium.
http://en.wikipedia.org/wiki/Visible_spectrum
Physics - Anonymous, Friday, April 18, 2008 at 3:52pm
ok I understand why I did it wrong thank you

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