Electromagnetic and Sound Waves Flashcards

1
Q

What is the range of ionizing radiation ?

A

> 10 eV or shorter than wavelength 125 nm

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2
Q

What wavelength is detected by the human eye?

A

400-750 nm (blue is 420 nm)

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3
Q

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

A

Perpendicular to velocity vector and perpendicular to magnetic field planes

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4
Q

What are the two directions of circular polarized light?

A

Clockwise and counterclockwise clockwise

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5
Q

What does optical dichroism show?

A

Ability of molecule to absorb clockwise and counter clock wise light

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6
Q

Absorption peak means what about a substance?

A

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

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7
Q

Energy equation with plank’s constant

A

E = hf

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8
Q

Equation for intensity of a sound wave

A

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

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9
Q

What is the Doppler effect equation?

A

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)

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10
Q

What is the relationship of intensity and amplitude?

A

Directly proportional

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11
Q

What are observing and source in Doppler ultrasound?

A

Blood is moving sound source

Transducer is stationary

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12
Q

doppler effect numerator

A

v(sound) +/- v(observer)

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13
Q

doppler effect denominator

A

v(sound) -/+ v(source)

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14
Q

doppler effect US

A

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

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15
Q

ULTRASOUND

A

> 20 kHZ

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