Electromagnetic and Sound Waves

Question 1

What is the range of ionizing radiation ?

Answer 1

> 10 eV or shorter than wavelength 125 nm

Question 2

What wavelength is detected by the human eye?

Answer 2

400-750 nm (blue is 420 nm)

Question 3

Electric field component of electromagnetic wave is what and what directions to the the velocity vector and plane of magnetic field?

Answer 3

Perpendicular to velocity vector and perpendicular to magnetic field planes

Question 4

What are the two directions of circular polarized light?

Answer 4

Clockwise and counterclockwise clockwise

Question 5

What does optical dichroism show?

Answer 5

Ability of molecule to absorb clockwise and counter clock wise light

Question 6

Absorption peak means what about a substance?

Answer 6

It will not be that color
Example highest peak around 700 nm of light, means solution is NOT red
- likely green

Question 7

Energy equation with plank’s constant

Answer 7

E = hf

Question 8

Equation for intensity of a sound wave

Answer 8

I = 1/2 density * w * angular frequency^2 * amplitude^2

Question 9

What is the Doppler effect equation?

Answer 9

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)

Question 10

What is the relationship of intensity and amplitude?

Answer 10

Directly proportional

Question 11

What are observing and source in Doppler ultrasound?

Answer 11

Blood is moving sound source

Transducer is stationary

Question 12

doppler effect numerator

Answer 12

v(sound) +/- v(observer)

Question 13

doppler effect denominator

Answer 13

v(sound) -/+ v(source)

Question 14

doppler effect US

Answer 14

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

Question 15

ULTRASOUND

Answer 15

> 20 kHZ