Electromagnetic and Sound Waves Flashcards
What is the range of ionizing radiation ?
> 10 eV or shorter than wavelength 125 nm
What wavelength is detected by the human eye?
400-750 nm (blue is 420 nm)
Electric field component of electromagnetic wave is what and what directions to the the velocity vector and plane of magnetic field?
Perpendicular to velocity vector and perpendicular to magnetic field planes
What are the two directions of circular polarized light?
Clockwise and counterclockwise clockwise
What does optical dichroism show?
Ability of molecule to absorb clockwise and counter clock wise light
Absorption peak means what about a substance?
It will not be that color
Example highest peak around 700 nm of light, means solution is NOT red
- likely green
Energy equation with plank’s constant
E = hf
Equation for intensity of a sound wave
I = 1/2 density * w * angular frequency^2 * amplitude^2
What is the Doppler effect equation?
F’ = f (v +/- vo / v -/+ vs)
Vs: negative towards (decreasing in distance), positive when away (increasing in distance)
Vo: opposite, so when positive when moving towards source (getting louder), negative when moving away (getting softer)
What is the relationship of intensity and amplitude?
Directly proportional
What are observing and source in Doppler ultrasound?
Blood is moving sound source
Transducer is stationary
doppler effect numerator
v(sound) +/- v(observer)
doppler effect denominator
v(sound) -/+ v(source)
doppler effect US
observer usually transducer: so v(observe) = 0
v(sound) blood flow given and emitted frequency given
v(source) = blood flow is measured and creates perceived frequency
ULTRASOUND
> 20 kHZ