Quiz 1, 2, 3, 4, and 5
the log of 2
.3
One foot equals
.3048 meter
log of 3
.48
log 4
.6
log 5
.7
log 6
.78
log 7
.85
log 8
.9
log 9
.95
log of 1
0
log 10
1
if pressure increase at a ratio of 7:1 at what ration does intensity increase?
49:1
One radian is equal to
53.3 degrees
velocity
c= (Δx)/(Δt)
Sound is best characterized/ defined as
changes in density traveling through the carrying medium
a logarithm consist of:
characteristic and mantissa
6.1 x 10^-2 re: 2 x 10^1 μPa is measured in...
dB SPL
which is the final step to solving an antilog?
express the number in conventional notation
Which is the first step to solving a logarithm
express the number in scientific notation
The acoustic power of a sound is measured by the energy per second per square meter
false
Amplitude
the maximum displacement from equilibrium of particles in a medium, as the sound wave passes through
frequency
the number of times a sinusoid repeats itself per unit time
starting phase
the point in the cycle of displacement at the instant vibration begins
mass
the quantity of matter that is present
if you are given an absolute intensity of 6.1 x10^-2 watts/m^2 and a reference intensity of 10^-12, would be able to calculate number representing
dBIL
as you tighten a string on your guitar the frequency increases and the wavelength
decreases
1 N/m^2 is equal to
10 dynes/ cm^2, 1 Pa, 10 dynes/cm^2
if the absolute sound pressure is 10^5 times greater than reference, 20 upa, what is the relative pressure in dB SPL
100 dB SPL
Which of these is not a valid way to express a number in scientific notation? 13x10^4 4.5x10^3 2.4x10^-6 7x10^2
13x10^4
if intensity is doubled, dB IL increases by
3 dB
Sci note: .003
3x10^-3
300
3x10^2
Sci note: 3000
3x10^3
if pressure is halved, dB SPL decreases by
6 dB SPL
please select the equivalent bel value of 62 dB
6.2 bels
.00000064
6.4x10^-7
64,000,000
6.4x10^7
please select the equivalent decibel value of 9.4 bels
94 dB
If a child takes a handful of snow and compresses all of it into a tightly packed snowball, what property of the snow has changed
density
a sound has an abolute intensity of 10^-8 watt/m^2 with an absolute reference intensity 10^-12 the solution is 4------.
Bels
resistance---------, while reactance-----------
disspates energy; stores energy
Which two quantities are needed in order to describe an object's displacement
distance and direction
Elasticity is defined as
the ratio of stress force applied to an object to the degree of strain, or shape change the object undergoes.
The position of the tines of a tuning fork when no force has been applied is its
Equilibrium position
Force
F = m*a
Please select the law of logarithms that is best suited to solve the equations log10^6x4
First Law
please select the events that describe one complete cycle of vibration
equilibriuom to maximum positive displacement to equilibrium, to maximum negative displacement and back to equilibrium
please select the law of logarithms that is best suited to help solve the equation log10^8^9
Third Law
Object A has less inertia than object B. Therefore, object A has less mass
True
Displacement
X
Acceleration
a = (Δc)/(Δt)
Displacement
a change in an object's position
velocity
a change in displacement per unit time
damping is
a decrease in amplitude over time
rarefraction
a decrease in the density of air molecules
force
a push or a pull that can cause a change in the acceleration of a mass
Which of these has the greatest inertia?
a wieghtless astronaut floating inside the space station
watts is a measure of
absolute power
Newton's 1st Law
all bodies remain at rest or move in fixed direction at constant speed, in the absence of any external forces
Compression
an increase in the density of air molecules
angular velocity may be defined as
angular frequency, measured in radians per second
please select the equation that is equivalent to 10^6
antilog 10^6
When determining the resulting sound pressure level from two independent sound sources combined, we can add the two sound pressures and then convert to decibels to find the answer.
false
a very stiff spring has high compliance
false
dB IL is never equal to dB SPL because intensity is proportional to the square of pressure
false
mass reactance and compliant reactance cause energy to be dissipated
false
sound waves in air are transverse waves
false
the characteristic and the mantissa can both be positive or negative values
false
please select the law of logarithms which is best suited to solving the equation log10^1/7
fourth law
The speed of sound is faster in warmer air than cooler air. as a sound with constant frequency travels from an area of cool air to warm air, it speed -------- its wavelength ------------ frequency -------
increases, increases, and stays the same
which scale allows for measuring the degree of difference between two items but does not allow division or multiplication between those items
interval scale
please select the statement that is equivalent to the x in 10^x= 1,000,000
log10^6
the natural frequency of a system decreases as ---------- increases and increases as -------- increases
mass, stiffness
Which scale of measurement allows us to know when values are greater or less than one another, but does not allow us to perform mathematical computations
ordinal
Pressure
p = F/A
23 uPa is a measure of
pressure
The formula dB=20log10 (px/Pr) gives you the sounds
pressure level
-5 dB SPL means
px < pr
--------- has no relationship with frequency
resistance
when converting .00062 into scientific notation, the decimal point must move to the -----------, and the resulting exponent is----------.
right; negative
please select the law of logarithms that is best suited to solving the equation log10^5/3
second law
when a body moves around the circumference of a circle at a constant number of degrees of rotation per second, the motion can be described as:
simple harmonic motion, sinusoidal motion, uniform circular motion
Newton's 2nd Law
the acceleration of an object is directly proportional to the net force applied to the object and inversely proportional to the object's mass
pressure
the amount of force exerted over a specified area
period
the amount of time that is required for a sinusoid to complete one cycle
weight
the attractive gravitational force extert on an object by the earth
wavelength
the distance traveled by a sine wave during one period of vibration
length
the extent of spatial separation between two points
the fourth law of logarithms states
the log of a reciprocal is equal to the negative log of the number
The first law of logrithms states
the log of any product is equal to the sum of the logs of the factors
the second law of logrithms states
the log of some ratio is equal to the difference between the logs of the factors
The third law of logarithms states
the log of the number a raised to the bth power is equal to b times the log of a
density
the mass per unit volume
A car traveling in a circle at a constant speed is undergoing acceleration
true
Two sources apply an equal amount of force on an object in the same direction. the resultant force is double that of the force applied by one source alone
true
in order for a sound to propagate, air particles go through compression and rarefaction but do not move great distances away from their initial starting point
true
momentum of the pendulum is greatest when it passes through the point of equilibrium
true
the bel is a unit of measurement named after telephone inventor alexander graham bell
true
the unit of measure for intensity is the watt per square meter (watt/m^2)
true
Newton's 3rd law
with every force there must be a reaction force of equal magnitude in the opposite direction