Ch301 test #1 Ep1-4 Flashcards
λ
Wavelength
ν
Frequency
Speed of light numerical value
3.0 * 10^8 m/s
Speed of light equation
c=ν(λ)
Density of water
1 g/mL at 25 degrees C
1 Angstrom to m?
1A =10^-10 m
1 cm^3 to ml?
1 mL
1 inch to cm?
2.54 cm
Nano to meters
20
20*10^-9
Electromagnetic spectrum ranking
Smallest to largest frequency
Largest to smallest wavelength
#1
Radio
Electromagnetic spectrum ranking
Smallest to largest frequency
Largest to smallest wavelength
#2
Microwave
Electromagnetic spectrum ranking
Smallest to largest frequency
Largest to smallest wavelength
#3
Infrared
Electromagnetic spectrum ranking
Smallest to largest frequency
Largest to smallest wavelength
#4
Visible
Electromagnetic spectrum ranking
Smallest to largest frequency
Largest to smallest wavelength
#5
UV
Electromagnetic spectrum ranking
Smallest to largest frequency
Largest to smallest wavelength
#6
X-ray
Electromagnetic spectrum ranking
Smallest to largest frequency
Largest to smallest wavelength
#7
Gamma ray
Visible spectrum colors
Red
Orange
Yellow
Green
Blue
Violet
Continuous spectrum
Has all wavelengths with no gaps over wide range
Emission spectrum
e- in excited State moves to a lower E level, emits a certain amount of E as photons
Glowing hot gas emit lines of light
Absorption spectrum
e- absorb E from a source to go from lower E to higher E level
Tendency of cool atmospheric gas to absorb same lines of light as absorption lines
Equation to predict spectral lines of H
1/λ =R((1/n^2¥1) -(1/n^2¥2))
Are emissions lines random
No there’s a mathematical pattern
Bohr model
e- can only be at certain distances from nucleus, their E are quantized
Only for H
Bohr model doesn’t work w
Atoms w more than 1 e-
What equations only work w atoms w one electron?
Bohr model and Rydberg equation
Does emission spectra vary btwn elements
Yes, E levels for diff elements have diff E
Rydberg Constant
1.097*10^7 m^-1
Frequency and wavelength have what relationship
Have inverse relationship
What is wavelength
Distance from peak to peak
Frequency
# of peaks that pass a point in space in 1 sec, units are per sec (s^-1)
What unit is wavelength
Meters
What unit is frequency
Hertz
1/sec or s^-1
What is light?
2 parts
Form of energy moving in a straight path
Made of 2 interacting waves
What 2 interesting waves is light made of
Magnetic field wave and electromagnetic wave
Red wavelength
Absolute Left
Lowest E
λ=700 nm
Blue wavelength
Blue is the absolute right
λ=400 nm, highest E
How do you get a more intense color display
Burn more atoms
4 possible options for when light encounters matter
1)light passes thru matter unaffected
2)the path of light bends as light passes thru matter
3) light bounces off surface of matter
4) light is absorbed by matter
What’s another word for light
EM radiation
Electromagnetic radiation
What’s the Planck equation
E=hv
What is E in words(in Plancks equation)
E is the total E in Joules of a single photon w a frequency of v(nu)
What does Ephoton =
Ephoton = hc/λ
What color is white light
ALL the colors
If H atoms are heated or electrically excited it gives off?
Emission spectrum
If continuous stream of visible light is passed thru sample of H atoms?
They absorb light but only at specific wave lengths
Absorbance spectrum
Even though hydrogen is a diatomic gas
It exists as individual atoms
If light is being emitted what happens to the E of the e-
It decreases
When e- drops E level what happens to the wavelength
It is predicted that the wavelength of light is given off
When do e- absorb E?
When e- transition to higher E level
What does R equal
3.29*10^15 hertz
