While a graduate student at UCLA, your professor used to spend a lot of time at

Question

While a graduate student at UCLA, your professor used to spend a lot of time at the beach studying physics. While there, he absorbed many photons of ultraviolet light in order to get tan, (which may partially account for his occasional skin cancer later in life.)

b) What is the wavelength of the light?
nm

While a graduate student at UCLA, your professor used to spend a lot of time at the beach studying physics. While there, he absorbed many photons of ultraviolet light in order to get tan, (which may partially account for his occasional skin cancer later in life.) a) If each photon of light had an energy of 8.5 x 10^-19 J, what was the frequency of the light? Hz b) What is the wavelength of the light? nm

Explanation / Answer

a)

E = h f

frequency

f = E / h = (8.5* 10^ -19 J ) / ( 6.63* 10 ^ -34 J s )

= 1.28* 10 ^ 15 Hz

b)

wavelength

lamda = c / f

= ( 3 * 10^ 8 m/s ) / 1.28* 10 ^ 15

= 234 nm

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