3.5 - energy levels and spectra

Question 1

describe a rainbow

Answer 1

natural display of the colors produced by sunlight

• raindrops split the light into a continuous spectrum

Question 2

describe a line spectra

Answer 2

• each line corresponds to a certain wavelength
• the photons that produce 1 line all have the same energy
• each photon is emitted when an atom de-exites

Question 3

what is the range of wavelength for visible light

Answer 3

400 - 700 nm

Question 4

how is a line absorption spectra produced

Answer 4

• a tube of glowing cold gas produces light on a screen
• there are spaces of blackness on the colored spectrum,
• spaces correspond to the certain frequencies of photons that have been absorbed, exited the atom and emitted from de-excitation away from the observer

Question 5

describe line emmision spectra compared to a line absorbson spectra

Answer 5

produced from an exited hot gas

its fully black (doesn’t show full spectrum) with only a few lines if colors indicating the decreet energy levels of the atom

• only showing the photons produced by de-excitation

Question 6

why is cold gas used for line absorption spectrums

Answer 6

since the e- will be in their ground state, do the processes can show the correct discrete energy levels the natural places te e- are in