Quiz Questions - SLHS

One foot equals

0.3048 meter

1 N/m2 is equal to (check all that apply)

10 dynes/cm2

If the absolute sound pressure is 105 times greater than reference, 20 μPa, 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?

13 x 10^4

If intensity is doubled, dB IL increases by

3 dB

If pressure increases at a ratio of 7:1, at what ratio does intensity increase?

49:1

One radian is equal to

57.3°

If pressure is halved, dB SPL decreases by:

6 dB SPL

Please select the equivalent bel value of 62 dB.

6.2 Bels

Please select the equivalent decibel value of 9.4 bels.

94 dB

Displacement

A change in an object's position

Velocity

A change in displacement per unit time

Damping is

A decrease in amplitude over time

Rarefaction

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 items has the greatest inertia?

A weightless astronaut floating inside the space station

Newton's 1st Law

All bodies remain at rest or move in a 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

A sound has an absolute intensity of 10-8 watt/m2 with an absolute reference intensity of 10-12 watt/m2. Consider the problem: log10 (10-8/10-12) = 4. The solution is 4 ________.

Bels

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

Which two quantities are needed in order to describe an object's displacement?

Distance and direction

The position of the tines of a tuning fork when no force has been applied is its

Equilibrium position

Please select the events that describe one complete cycle of vibration

Equilibrium to maximum positive displacement, to equilibrium, to maximum negative displacement, and back to equilibrium

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

Force equation

F = m*a

A very stiff spring has high compliance

False

Mass reactance and compliant reactance cause energy to be dissipated.

False

Sound waves in air are transverse waves

False

The acoustic power of a sound is measured by the energy per second per square meter.

False

The characteristic and the mantissa can both be positive or negative values

False

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

dB IL is never equal to dB SPL because intensity is proportional to the square of pressure.

False

Suppose a freezer makes water into ice cubes in one hour's time. The change from water into ice reflects the freezer's [a], while the fact that it is done in an hour demonstrates its [b].

Suppose a freezer makes water into ice cubes in one hour's time. The change from water into ice reflects the freezer's *work, while the fact that it is done in an hour demonstrates its *power.

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 exterted 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 Logarithms states

The log of any product is equal to the sum of the logs of the factors

The Second Law of Logarithms 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

Amplitude

The maximum displacement from equilibrium of particles in a medium, as the sound wave passes through

The natural frequency of a system decreases as [x] increases, and increases as [y] increases

The natural frequency of a system decreases as Correct mass increases, and increases as Correct stiffness increases

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

Elasticity is defined as

The ratio of the stress force applied to an object to the degree of strain, or shape-change, the object undergoes.

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, its speed [x], its wavelength [y], and its frequency [z]

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, its speed *increases*, its wavelength *increases*, and its frequency *stays the same*.

A car traveling in a circle at a constant speed is undergoing acceleration

True

In order for a sound to propagate, air particles go through compressions and rarefactions, but do not move great distances away from their initial starting point. T or F?

True

Momentum of the pendulum is greatest when it passes through the point of equilibrium

True

Object A has less inertia than Object B. Therefore, Object A has less mass

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

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

Newton's 3rd Law

With every force there must be a reaction force of equal magnitude in the opposite direction

Acceleration equation

a = (Δc)/(Δt)

108 watts/m2 is a measure of

absolute intensity

"Watts" is a measure of

absolute power

Velocity equation

c = (Δx)/(Δt)

Sound is best characterized/defined as

changes in density traveling through the carrying medium

A logarithm consists of:

characteristic & mantissa

6.1 x 10-2 watts/m2 relative to a reference level of 10-12watts/m2 is a measure of:

dB IL

6.1 x 10-2 re: 2 x 101 μPa is measured in...?

dB SPL

As you tighten a string on your guitar, the frequency increases and the wavelength ____________

decreases

Resistance __________, while reactance ___________.

dissipates energy; stores energy

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 10x=1,000,000

log10 of 1,000,000

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 scale

Pressure equation

p = F/A

23 μPa is a measure of

pressure

The formula dB=20log10(Px/Pr) gives you the sound's...

pressure level

-5 dB SPL means

px<pr

____________ has no relationship with frequency.

resistance

When converting 0.00062 into scientific notation, the decimal point must move to the _______________, and the resulting exponent is _______________

right; negative

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

uniform circular motion simple harmonic motion sinusoidal motion

Displacement equation

x