Show:
Sound
Light
Experimental
100
Two sounds of equal pitch are heard. The first is quiet, the second is loud. What is different -- their amplitude, frequency, or wavelength?
Amplitude
100
What is the speed of light in air (metric)?
3x108 m/sec
100
If you have two pipes of different lengths, which one will produce sound with the longest wavelength, the shorter pipe or the longer pipe?
The longer pipe will produce longer wavelengths (and a lower pitch).
200
What is the relationship between frequency, speed and wavelength of a wave?
f = v/l
200
When light (or any wave) hits an obstacle, it tends to spread out. This is known as ___________.
Diffraction
200
Air temperature can affect sound. Which property is directly affected by air temperature -- frequency, wavelength, speed, or amplitude?
The speed of sound is affected by air temperature.
300
A _______ wave has its oscillation parallel to its propagation.
Longitudinal
300
Since a wave must propagate in a medium, what is light's "medium"?
It oscillates electric and magnetic fields.
300
What is the name of the effect we observe when sound sources are moving and the frequency of the sound seems different?
The Doppler Effect
400
The speed of sound (increases/decreases) as air temperature increases.
Increases. v = (331.5 + 0.606 T) m/sec
400
What is the work function of a metal?
The energy with which a metal holds onto electrons (or the energy required to free electrons).
400
In the Doppler Effect equation, there are +/- signs in both the numerator and denominator. How do we know which to use?
We use our Physics Cortex, and if the observed frequency should be higher, we use the + in the numerator and - in the denominator (and vice-versa).
500
Sound waves are (transverse/longitudinal).
Longitudinal
500
What is the particle-wave duality of light?
In some situations, light is best described as particles, but in other situations, it is best described as a wave.
500
If you have two pipes of the same length, but different temperatures, which one will produce the higher frequency?
The one with the higher temperature. f=v/l and v=(331.5 + 0.606T)