EM Radiation

Question 1

What is the spectrum for visible light?

Answer 1

0.4 - 0.7 um

Question 2

What is the spectrum for solar radiation, “shortwave radiation” (SW)?

Answer 2

0.2-4 um (UV, vis, IR)

Question 3

What is the spectrum for Earths radiation, “longwave radiation” (LW)?

Answer 3

4-100um (IR)

Question 4

Speed of light

Answer 4

c = 300 000 km/s (8 min form sun to Earth)

Question 5

Relationship between frequency and wavelength

Answer 5

c = lambda * ny

lambda: wavelenth [m]
ny: frequency [Hz]

Question 6

Formula for photon

Answer 6

No mass and the energy
E = h*ny (hv)
h: Placks constant

Question 7

What laws defines the Black Body Radiation spectrum and the total energy emited?

Answer 7

• Placks law for the spectrum
• Stefan-Boltzmanns law for the total Energy:
  B(T) = sigT^4 [W/m2]
  sigma = 5.6710^-8 Stefan-Boltzmann constant

Question 8

Scattering:

Answer 8

deviation of (I) light in “all direction”