Problem 1A9. How to determine which values the reading event corresponds to?

[KayleyW_3L]

Problem 1A9: "A college student recently had a busy day. Each of the student’s activities on that day (reading, getting a dental x-ray, making popcorn in a microwave oven, and acquiring a suntan) involved radiation from a different part of the electromagnetic spectrum. [etc] "

I was able to solve for all of the frequencies, wavelengths, and photon energies. However, I am confused as to how the reading was determined.
The textbook solution says that reading event corresponds to the values 5.0x10^14Hz, 600nm, and 3.3x10^19 values, but how would I know that?

[AngieGarcia_4F]

Match the values to table 1A.1 on page 6.

[Daniel Honeychurch1C]

When reading, you are exposed to radiation from visible light (600 nm is in the visible spectrum). You are able to read because visible light reflects off the book and goes into your eye.

[Suraj Doshi 2G]

When reading, we are exposed to natural visible light which is within the range of 400nm to 700nm. Thus, we can conclude that 600nm is some form of visible light and therefore pertains to the activity of "reading".

[BryantChung_4B]

Basically looking at something is just processing visible light. Generally we know that visible light wavelengths range from about 400 to 700 nm, so 600 nm would be suitable for reading.