Hi all. Here I will post a few questions on physics and light. If anyone can help me and has time to explain how they get the answers, let me know 1. Yellow light has a wavelength of 575 nm (nanometers). What is its approximate frequency? A. 5 x 10^12 Hz B. 2 x 10^14 Hz C. 5 x 10^14 Hz D. 5 x 10^15 Hz 2. If a blackbody is heated to a temperature T (in degrees Kelvin, K, where K = âˆ˜C + 273), the wavelength where it appears brightest (the peak of the blackbody curve) occurs at a wavelength, Î»peak (in METERS), given by Wien's Law: Î»peak x T = 0.0029 From Wien's Law above, at what wavelength, Î»peak, does a chair at room temperature (T=290 K) look brightest? A. 10 meters B. 10^-3 meters C. 10^-4 meters D. 10^-5 meters 3. Referring to your answer from Question 2 (the Wien's Law problem), what is the corresponding frequency of that radiation? A. 3x10^13 Hz B. 4x10^13 Hz C. 5x10^14 Hz D. 5x10^15 Hz 4. Referring once again to the Wien's law question 2, in what part of the radiation spectrum does the peak radiation occur? A. Visible B. Infrared C. Ultraviolet D. X-rays **Any help would be appreciate it. I think I know some of the answers, but I am trying to double check. Thanks in advance.

1. B Code: http://answers.yahoo.com/question/index?qid=20091129202534AALzkuk 2. D x(290) = .0029 x = .0029/290 x = 10^-5 meters 3. A (3 x (10^8)) / (10^(-5)) = 3.0 × 10^13 4. B Code: http://hyperphysics.phy-astr.gsu.edu/hbase/ems3.html#c1 Depending on how much the big G likes me today, should be right. Could be completely wrong though... ND

I use to be a physics tutor.... a long time ago. Let's see if I remember. speed of light = wavelength x frequency 3 x 10^8 = wavelength x frequency wavelength=575 nm if converted to meters is 5.75 x 10^-7 Meters so solving for frequency: Frequency = speed of light /wavelength= 3x10^8 / 5.75 x 10^ -7 = 5.2 x 10 ^14 Hz So "C" seems to be the correct answer. Double check this answer... i did it from memory.... no google used.

Yes I got C as well. Wow Virus you did that from memory and looks right on. Mind trying any of the others? I would like to see if I got them right... Or hope I did. It is always nice to have more than one mind on solving problems.