EMR Facts Flashcards
1
Q
Radio waves
A
- spin nucleus
- MRI
- 1 mm to 100s m
2
Q
micro waves
A
- 100 micrometers 100 cm
- excited spin of electrons
- rotate
- excites rotation of h20, fats molecules around 12cm to cook food
3
Q
infrared
A
- 800 to 1000 nm (1 micrometer)
- causes vibrations in molecules
- night vision googles
- excited wavelength of -OH in ethanol and used to measure intoxication
4
Q
visible
A
300-800 nm
- causes excited valence e-‘s to higher energy level
- solution for H atom
- rays of detection for human eye
5
Q
UV
A
- 300 to 10 nm
- excites valence electron
- Lyman series for H emission
n =1 excited - causes sun burn
6
Q
X- rays
A
- 10 to .01 nm
- excites core e’s in atoms
used in medicine for invasive in imaging - causes cell mutations so limit exposure
7
Q
Gamma-rays
A
less than 0.01 nm
associated with decay of atom nucleus
emitted from stars hence cosmic ray name
