Medical X-ray, with a wavelength of about 10^-10m, can penetrate completely through our skin.

A. Unltraviolet rays have a wavelength of about 1000 times the wavelength of an X-ray. find the wavelength of ultraviolet rays. Show your work.

B. The wavelengths of visible light are between 3.8*10^-7m and 7.*10^-7m. Are these wavelengths longer or shorter than those of unltraviolet rays? explain.

Question

Medical X-ray, with a wavelength of about 10^-10m, can penetrate completely through our skin.

A. Unltraviolet rays have a wavelength of about 1000 times the wavelength of an X-ray. find the wavelength of ultraviolet rays. Show your work.

B. The wavelengths of visible light are between 3.8*10^-7m and 7.*10^-7m. Are these wavelengths longer or shorter than those of unltraviolet rays? explain.

phi · Answer

For A. multiply the wavelength of an x-ray by 1000 (10^3)

anonymous · Answer

Okay so 10^-7 if you add the exponents 10^3 and 10^-10

phi · Answer

yes, but I would add the units  10^-7 m

anonymous · Answer

Add them?

phi · Answer

I mean put in the m  (for meters)

phi · Answer

It is just a good habit to write down the units....

anonymous · Answer

Oh okay I see what you mean.

anonymous · Answer

So that would be the answer for the A. part of the problem right?

phi · Answer

for B,  we know that 10^-7 m is the same as 1*10^-7 m
compare to 3.8*10^-7m 
which is bigger ?

anonymous · Answer

3.8*10^-7 would be the bigger one.