The rays of the Sun that cause tanning and burning are in the ultraviolet portion of the electromagnetic spectrum. These rays are categorized by wavelength: So-called UV-A radiation has wavelengths in the range of 320-380 nm, whereas UV-B radiation has wavelengths in the range of 290-320 nm.
Part A
Calculate the frequency of light that has a wavelength of 345 nm .
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ν = | s−1 |
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Part B
Calculate the energy of a mole of 345 − nm photons.
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E = | kJ/mol |
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Part C
Which are more energetic, photons of UV-A radiation or photons of UV-B radiation?
photons of UV-A radiation |
photons of UV-B radiation |
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Part D
The UV-B radiation from the Sun is considered a greater cause of sunburn in humans than is UV-A radiation. Is this observation consistent with your answer to part (c) ?
yes
no
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