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Homework Help: Scientific Notation's Got Me Blown!

  1. Jul 26, 2011 #1
    1. The problem statement, all variables and given/known data
    A laser used to dazzle the audience in a rock concert emits green light with a wave length of 515 nm. Calculate the frequency of the light.

    2. Relevant equations

    V = C/Lambdah

    3. The attempt at a solution
    http://img36.imageshack.us/img36/7982/unledpg.jpg [Broken]

    ** In the image I forgot to knock off the "nm" after I did the dimensional analysis to convert it to m disregard it***

    My answer when I put it in my calculator is what's in the image but the book has the correct answer as: 5.83 x 10^14 s

    How did they get 10x^14? If the bases aren't the same what happens to the exponents?

    There was another problem which was solved by the book itself:

    3.00 x 10^8 m/(s/s) - **(means s cancels out)
    4.62 x 10^14 /(s/s) - ** (means s cancels out)

    = 6.49 x 10^-7 m (how did they get -7?)!

    Btw, I'm doing the wavelength and frequency equation in Chemistry.
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Jul 26, 2011 #2


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    When you put it into your calculator, you did [itex]{{3x10^8}\over{515}}*10^-9[/itex] to get that answer. Make sure you enclose the 10^-9 part in the denominator with parenthesis.
  4. Jul 30, 2011 #3
    correct and I love your tagline pengwuino amazingly some physicists I know that don't believe in evolution....truly I fear for my country and the world...
  5. Jul 30, 2011 #4


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    Thanks. Someone else on the forum actually said it and I stole it from him to use as a signature.

    Unfortunately, a couple people have said "Oh so you think evolution is fake huh!".
  6. Jul 30, 2011 #5
    good lord.....people here? Do they not understand science...???? Theory in science means FACT. RAGE!!!!! Sigh....I mean theory of gravity anyone?
  7. Jul 30, 2011 #6


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    Hmm careful, no it doesn't. In scientific context, "facts" are few and far between. A theory in science really has its own meaning that is not exactly like "fact" and far from the lay term "theory".
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