minimoo
PLEASE HELP
medical x-rays, with a wavelength of about 10^-10m, can penetrate completely through your skin.
Ultra violet rays, which cause sunburns by penetrating only the top level of skin, have a wavelength about 1000 times the wavelength of an x-ray. find the wavelength of ultraviolet rays. show your work.
Hint: scientific notation.
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AravindG
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first did you get the wavelength of ultraviolet rays ?
minimoo
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no i was going with 1000 x 10^-10 but thats not right.
AravindG
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you are right !
minimoo
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thats all i do?
AravindG
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now just ensure you report answer in scientific notation
AravindG
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ie in the form
\[a \times 10^b\]
manishsatywali
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|dw:1359548779460:dw|
manishsatywali
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i have just use the scientific notation form
minimoo
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so i dont have to solve it? and @manishsatywali why +3 to the exponent?
AravindG
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@manishsatywali we at openstudy do not appreciate giving direct worked out answers like that .Instead help the user get to the answer. Refer openstudy COC
http://openstudy.com/code-of-conduct
manishsatywali
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I HAVE USED THE PROPERTY : M ^n * M ^ b = M ^(n+b)
minimoo
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???
manishsatywali
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here M = 10 and n = 3 , b = -10
manishsatywali
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did u get that ?
minimoo
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whats the n for?
manishsatywali
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n = 3
manishsatywali
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10^3 * 10^(-10)
minimoo
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but why do you need 10^3? where does it come from in the problem?
manishsatywali
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1000 = 10 ^3
minimoo
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wouldnt that be 1 x 10^3?
AravindG
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\[10^3=1 \times 10^3\]
manishsatywali
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@AravindG IS RIGHT DO U FOLLOW HIM NOW ?
minimoo
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so thats how i get the -10+3?
manishsatywali
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yup
AravindG
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yep :)
manishsatywali
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now u understand what i was trying to say
minimoo
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so it would be (1 x 10^-10)(1 x 10^3) ? which simplifies to 1 x 10^-7?
minimoo
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right?
manishsatywali
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yes u got it
minimoo
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ok :) thanks.