3.5- ENERGY LEVELS AND SPECTRA Flashcards
What is a rainbow a natural display of?
colours of the spectrum of sunlight
What do raindrops do sunlight?
split sunlight into a continuous spectrum of colours
What can be used to split a beam of white light from a filament lamp?
prism
What does a prism splits a beam of white light from a filament lamp into?
continuous spectrum
How does the wavelength of the light photons that produce the spectrum change across the spectrum?
increases
How does the wavelength of light photons increase across the spectrum?
from deep violet at less than 400nm to deep red at about 650nm
What do we see if we use a tube of glowing gas as the light source instead of a filament lamp?
spectrum of discrete lines of different colours instead of a continuous spectrum
What is the wavelength of the lines of a line spectrum of an element a characteristic of?
atoms of that element
What can we identify by measuring the wavelength of a line spectrum?
identify the element that produced the light
Can different elements produce the same pattern of light wavelengths?
no- no other element produces the same pattern of light wavelengths
Why does no other element produce the same pattern of light wavelengths?
energy levels of each type of atom are unique to that atom
so photons emitted are characteristic of the atom
What is each line in a line spectrum due to?
light of a certain colour + so certain wavelength
What do the photons that produce a line on the line spectrum have the same of?
same energy
What is the energy of photons producing different lines on the line spectrum like?
different energies
When is each photon emitted? (line spectrum)
when atom de-excites due to one its electrons moving to an inner shell
