UV-A rays are important for the skin\'s production of vitamin D; however, they t

Question

UV-A rays are important for the skin's production of vitamin D; however, they tan and damage the skin. UV-B rays can cause skin cancer. The wavelength range of UV-A rays is 320 nm to 400 nm and that of UV-B rays is 280 to 320 nm.

Part A

What is the lower frequency of UV-A?

Express your answer to two significant figures and include the appropriate units.

fmin =

Part B

What is the upper frequency of UV-A?

Express your answer to two significant figures and include the appropriate units.

fmax =

Part C

What is the lower frequency of UV-B?

Express your answer to two significant figures and include the appropriate units.

fmin =

Part D

What is the upper frequency of UV-B?

Express your answer to two significant figures and include the appropriate units.

fmax =

Explanation / Answer

UVA

fmin=3*10^8/400nm =7.5*10^14 Hz

fmax=3*10^8/320nm=9.375*10^14 Hz

UVB

fmin=3*10^8/320nm=9.375*10^14Hz

fmax=3*10^8/280nm=1.07*10^15Hz

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