Formulas
Formula for wave velocity V
v = (frequency)x(wavelength)
this is how you find the angle of reflection
equal to the angle of incidence
What is the wavelength (in m) of an earthquake that shakes you with a frequency of 10.0 Hz and gets to another city 84.0 km away in 12.0 s?
700 m
A “showy” custom-built car has two brass horns that are supposed to produce the same frequency but actually emit 263.8 and 264.5 Hz. What beat frequency is produced?
0.7 Hz
In the state of Georgia, it's illegal to eat this with a fork
fried chicken
formula for beat frequency
fB = | f1 - f2 |
if the electric field is pointing north and the magnetic field is pointing west, which direction is the electromagnetic wave traveling
up (use right hand rule)
A car has two horns, one emitting a frequency of 187 Hz and the other emitting a frequency of 235 Hz. What beat frequency do they produce?
48 Hz
What is the maximum electric field strength in an electromagnetic wave that has a maximum magnetic field strength of 5.00 x 10^-4 T?
1.5E5 T
this backyard kids' game was banned in Indonesia
hula hoops
formula for wave intensity
I = P/A
What are the units for Hz?
1/s
What is the wavelength of the waves you create in a swimming pool if you splash your hand at a rate of 3.00 Hz and the waves propagate at 0.840 m/s?
0.28 m
What length should an oboe have to produce a fundamental frequency of 110 Hz on a day when the speed of sound is 343 m/s? It is open at both ends.
1.56 m
fortune cookies were invented in this city
San Francisco
equation for Snell's law (the law of refraction)
n1(sin(x1))=n2(sin(x2))
if the magnetic field is pointing west and the electomagnetic wave is traveling down, which way is the electric field pointing
North
What frequency is received by a person watching an oncoming ambulance moving at 120 km/h and emitting a steady 850-Hz sound from its siren? The speed of sound on this day is 345 m/s.
939.9 Hz
At an air show a jet flies directly toward the stands at a speed of 1200 km/h, emitting a frequency of 3500 Hz, on a day when the speed of sound is 342 m/s. What frequency do the observers receive as the plane flies directly away from them?
1772 Hz
this term is used to describe the fear of long words
hippopotomostrosesquippedaliophobia
resonant frequencies of a tube closed at one end
f = (n)(v/4L)
(how about a tube open at both ends?)
if the electric field is going east and the electromagnetic wave is traveling south, which way is the magnetic field pointing
down
Ultrasound of intensity 1.5 x 10^2 W/m^2 is produced by the rectangular head of a medical imaging device measuring 3.00 by 5.00 cm. What is its power output?
22.5 W
24.36 Lasers can be constructed that produce an extremely high intensity electromagnetic wave for a brief time—called pulsed lasers. They are used to ignite nuclear fusion, for example. Such a laser may produce an electromagnetic wave with a maximum electric field strength of 1.00 10^11 V/ m for a time of 1.00 ns. (a) What is the maximum magnetic field strength in the wave? (b) What is the intensity of the beam? (c) What energy does it deliver on a 1.00 mm^2 area?
a. 333T
b. 1.33x10^19 W/m^2
c.13.3 kJ
this is the highest-selling product at Walmart
bananas