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Physics Test 4 Questions

Terms in this set (30)

9/5 of a Fahrenheit Degree is equivalent to
1 degree celsius
Boyles law and Charles law each respectively assume what is held constant?
temperature, pressure
The universal gas constant has what units
J/Mol-K
Avogadros number has what units
molecules/mole
The number of molecules in one mole of a substance
is the same for all substances
Which temperature scale never gives negative temperatures?
Kelvin
The temperature of triple point of water is equivalent to
273.16 K
If the pressure acting on an ideal gas at constant temperature is tripled, its volume is
reduced to one-third
When the engine of your car heats up, the spark plug gap will
decrease
Both the pressure and volume of a given sample of an ideal gas double. This means that its temperature in Kelvin must
quadruple
In the equation PV = NkT, the k is known as
Boltzmann's constant
The kinetic theory of gases suggests that the average kinetic energy per molecule is (For monatomic gas)
3/2 kT
Oxygen molecules are 16 times more massive than hydrogen molecules. At given temperature, how do their average molecular speeds compare? The oxygen molecules are moving
at 1/4 the speed
A sample of an ideal gas is heated and its Kelvin temperature doubles. What happens to the average speed of the molecules in the sample
it is Square root 2 times as large
Boltzmann's constant has what units
J/K
Which of the following is a false statment
Sound can travel through vacuum
Sound vibrations with frequencies less than 20 Hz are called
Infrasonics
As the temperature of air increases what happens to the velocity of sound? (assume that all other factors remain constant)
It increases
If you were to inhale a few breaths from a helium gas balloon, you would probably experience an amusing change in your voice. What is the cause of this curious high-pitched effect?
Sound travels faster in helium that in air at a given temperature
As atmospheric pressure increases, what happens to the velocity of sound? (Assume all other factors are constant)
it decreases
What happens to the velocity of sound in a gas when the absolute temperature of the gas is doubled?
It increases to 1.41 times its original value
Since the Helium molecule (He) us 2 times as massive as the hydrogen molecule (H2), the speed of sound in Hydrogen is _____ the speed in Helium
1.41
The intensity of a sound wave is proportional to its
power
You double your distance from a sound source that is radiating equally in all directions. What happens to the intensity of the sound? It reduces to
one-fourth its original value
When sound passes from air into water
its frequency does not change
Two coherent sound waves will constructively interfere when the path difference is the wavelength times what
an integer
Consider the standing wave on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in common?
they have the same frequency
The change in the frequency of a wave due to the motion of the source (or observer) is known as
The doppler effect
An unknown tuning fork is sounded along with a tuning fork whose frequency is 256. Hz and a beat frequency of 3. What is the frequency of the unknown tuning fork?
It could be either 253 Hz or 259 Hx, there is no way to tell
Only odd harmonics can be produced in a(n) ____organ pipe
closed
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