Ray Basics
21
Apr/100
Apr/100
Chemistry conversion help?
I really need to understand the basics of conversion and I am just not able to wrap my mind around it so far. I didn't do very well in my exam last week because of it.
Example: An x-ray has a wavelength of 1.3A (Angstroms). Calculate the energy (in Joules) of one photon of this radiation.
Please explain how and why if you can. Thank you!
Energy (E) in joules = (planks constant (h) x speed of light (c))/ wavelength (lamda)
In order to ensure your answer is in Joules, you must use all SI units (see link). You are given wavelength in angstroms and you need it to be in meters. Also, you must use the version of planks constant in Joules and speed of light in meters/sec
1angstrom = 1x10^-10meters
so E = [(6.62x 10^-34 joule seconds)(3.0 x 10^8 meters/sec)] / 1x10^-10 meters
meters and seconds cancel out and leave you with joules
do the calculation and get 1.986 x 10^-15 joules
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