Ch. 6: 4.10.19 Weekly Quiz material Flashcards
waves of energy given off when a charged particle vibrates
electromagnetic (EM) waves
the little part of the EM spectrum we can see
visible light
longitudinal waves through matter
sound
below 20 Hz
infrasound
above 20 KHz
ultrasound
the perceived highness of a sound
pitch
power per unit area of sound
intensity
the logarithmic scale of sound intensity
decibel
some facts about EM waves?
- they’re transverse
- they have an electric and magnetic component
- the components are at right angles
- they travel @ the speed of light (in a vacuum)
- they don’t need a carrier (like radiation)
examples of EM waves?
- radiowaves
- infrared
- ultraviolet (UV)
- x-rays
- microwaves
- gamma rays
range of visible light known as deep red
wavelength = 700 nm
F = 3.8 x 10^14 Hz
range of visible light known as deep blue
wavelength = 390 nm
F = 7.7 x 10^14 Hz
the range of human hearing is?
20 Hz to 20 kHz
how is pitch different from frequency?
frequency is measured; pitch is “a matter of opinion” (i.e., subjective)
how is intensity different from loudness?
intensity is measured; loudness is “a matter of opinion” (i.e., subjective)
equation: intensity
second intensity over first intensity is = to the square of the first distance over the second distance (inverse relationship)
