EMS 1
The arrangement of radiation consisting of electric and magnetic waves that travel at the speed of light. Radiation is arranged by wavelength.
Electromagnetic Spectrum
part of the EMS used in medical practices to see internal structures
x-ray
This color has very high energy, low wavelength, high frequency
Violet
What is the equation for energy (joules)?
E=hf
too much of this radiation can cause sunburn
ultraviolet
The distance between any two corresponding points on an adjacent wave.
wavelength
This type of wave has very high energy and can be dangerous/radioactive (though it is used to treat cancer)
gamma waves
How do scientists determine what stars are made of?
Look through a prism at the light, record the spectrum and compare it to the spectrum of known substance.
What is the "h" in E=hf
h = Planck's constant 6.626x10-34 Joule sec
What is higher energy - ground state or excited state
excited state
What do you call the top part of a wave (another word for crest)
peak
The part of the spectrum that human eyes can visibly detect
visible
1 meter = ? nm
1 x 10 9 nm = 1 m
what is the value of the speed of light
3 x 108 meters/sec
night vision goggles are an example of this
infrared radiation
List the parts of the EMS from longest wavelength to shortest wavelength
radio, microwaves, infra red, visible spectrum, uv, x-ray, gamma ray
what is the unit for Energy (E)?
joules
as the energy of EMS waves increases the wave frequency will
increase
High frequency = _______ wavelength
low, small
When an electron drops back down to ground state it releases this...
photon or light
Wavelength and energy are directly/indirectly related
indirectly - small wavelength, high energy
large wavelength, low energy
what are the 2 units for frequency
Hz or 1/second
All electro magnetic waves travel at this speed
c, the speed of light, 3x10 8 meters/sec
It never changes
When an electron absorbs energy (heat or electricity) it does this....
electrons absorb energy and move from ground state to the excited state.
do hydrogen and white light have the same spectrum when viewed through a prism?
No, white light is the entire visible spectrum, hydrogen has a unique spectrum of 4 lines.