Question

q6. (3.5 points) place the following types of light into order of increasing photon energy: red light, blue light, microwaves, x - rays.________ < ______ < ______ < ______out of the above, the electromagnetic radiation with the longest wavelength is________,q7. (1 point) true / false (circle one): frequencies for uvc light photons are greater than for uva photons.q8. (3 points) suggest three responses of the body to overexposure to outdoor sunlight:1)2)3)

Explanation:

Q6

Step1: Recall the relationship between photon energy and wavelength

Photon energy \(E = h
u=\frac{hc}{\lambda}\), where \(h\) is Planck's constant, \(c\) is the speed of light, \(
u\) is frequency and \(\lambda\) is wavelength. As \(\lambda\) increases, \(E\) decreases.

Step2: Recall the order of wavelengths of given radiations

The order of wavelengths (from longest to shortest) for microwaves (\(\lambda\approx10^{- 2}-10^{2}\text{m}\)), red light (\(\lambda\approx620 - 750\text{nm}\)), blue light (\(\lambda\approx450 - 495\text{nm}\)) and X - rays (\(\lambda\approx0.01 - 10\text{nm}\)) is: microwaves > red light > blue light > X - rays.
Since \(E\propto\frac{1}{\lambda}\), the order of increasing photon energy is:
microwaves < red light < blue light < X - rays
The electromagnetic radiation with the longest wavelength is microwaves.

The energy of a photon \(E = h
u\). UVC light has a shorter wavelength (\(\lambda_{UVC}\approx100 - 280\text{nm}\)) than UVA light (\(\lambda_{UVA}\approx315 - 400\text{nm}\)). Since \(
u=\frac{c}{\lambda}\) (where \(c\) is the speed of light), and \(E = h
u\), a shorter wavelength means a higher frequency. So, frequencies for UVC light photons are greater than for UVA photons.

When the body is overexposed to outdoor sunlight (which contains ultraviolet radiation):

1. The skin can produce more melanin (tanning) as a protective mechanism. Melanin absorbs UV radiation and prevents it from damaging the deeper layers of the skin.
2. Sunburn (erythema) can occur. This is due to damage to the skin cells (especially DNA damage in keratinocytes) by UV radiation, which triggers an inflammatory response.
3. Long - term overexposure can increase the risk of skin cancer. UV radiation can cause mutations in skin cell DNA, and if these mutations accumulate and evade the body's repair mechanisms, it can lead to uncontrolled cell growth (cancer).

Answer:

microwaves < red light < blue light < X - rays; microwaves

Q7