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Phisical Science Quarter 4 > Module 14 > Flashcards

Module 14 Flashcards

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1
Q

Transverse Wave:

A

A wave with a direction of propagation tat is perpendicular to its direction of oscillation.

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2
Q

Longitudinal Wave

A

A wave with a direction of propagation that is parallel to its direction of oscillation

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3
Q

Supersonic Speed:

A

Any speed that is faster than the speed of sound in the substance of interest.

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4
Q

Sonic Boom:

A

The sound produced as a result of an object traveling at or above Mach 1.

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5
Q

Pitch:

A

An indication of how high or low a sound is, which is primarily determined by the frequency of the sound wave.

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6
Q

In designing a car’s horn, the engineers test the sound of the horn and decide that its pitch is too low. To adjust the horn, should the engineers change the electronics so as to produce sound waves with longer or shorter wavelengths?

A

Shorter.

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7
Q

A sound wave is travelling through air with a temp of 30 degrees C, What is the speed of the wave?

A 
V = (331.5 + 0.6 * T) m/ sec
V = (331.5 + 0.6 * 30) m/ sec
V = (331.5 + 18) m/ sec
V = (349.5) m/ sec
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8
Q

If the sound wave in question 3 (V = (349.5) m/ sec) has a wavelength of 0,5 M, What is the frequency?

A

(349.5) m/ sec/0.5 m 3495/5 = 699sec

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9
Q

A sound wave has a speed of 345 M/Sec and a wavelength of 500 M. Is this wave infrasonic, sonic, or ultrasonic.

A

f = v/lamda = 345m/sec/500m = 0.69sec

Infrasonic.

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10
Q

A physicist takes an alarm Clock and puts it in an airtight chamber. When the chamber is sealed but still full of air, the physicist is able to hear the alarm despite the fact that he is outside of the chamber, If the physicist then uses a vacuum pump to evacuate essentially all the air out of the chamber, will the physicist still be able to hear the alarm? Why or Why not?

A

No because with out air the sound waves have nothing to travel through.

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11
Q

Are sound waves transverse waves or longitude waves?

A

Sound waves are longitude waves.

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12
Q

You are watching the lightning from a thunderstorm. You suddenly see a flash of lightning, and 2.3 sec later, you hear the thunder. How far away from you did the lightning strike?( Temp = 13 degrees C)

A

V = (331.5 + 0.6 * T) m/sec Speed = Distance Traveled
V = (331.5 + 0.6 * 13) m/sec Time Traveled
V = (331.5 + 7.8) m/sec Dt = Speed * tt
V = (339.3) m/sec Dt = 339.3 m/sec * 2.3 sec
Dt = 780.39m

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13
Q

Sound waves are traveling through the air and suddenly run into a wall. As the sound waves travel through the wall, do they travel faster, slower, or the same speed as when they were traveling in the air?

A

Faster

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14
Q

In the Situation is the last question (Sound waves are traveling through the air and suddenly run into a wall. As the sound waves travel through the wall, do they travel faster, slower, or the same speed as when they were traveling in the air?) What happens to the amplitude of the wave? is the amplitude of the wave smaller, larger or the same as the amplitude before the wave hit the wall?

A

Smaller

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15
Q

A jet aircraft is traveling at Mach 2.5 through air at 1 degrees C. What is the jet’s speed in m/sec?

A

V = (331.5 + 0.6 * T) m/sec
V = (331.5 + 0.6) m/sec
V = (332.1) m/sec
332.1 * 2.5 = 830.25 m/sec

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16
Q

A jet travels through air at 464.1 m/sec. If the air has a temperature of 0 degrees C, at what Mach number is the jet flying?

A

464.1 / 331.5 = 1.4

Mach 1.4

17
Q

Why do jets travel at speeds of Mach 1 or higher only in sparsely populated regions?

A

because they make a very loud sound which can damage ears and buildings

18
Q

A guitar player is plucking on a string. If he takes his finger and pinches the string to the neck of the guitar so as to shorten the length of the string, will the pitch of the sound emitted increase, decrease, or stay the same?

A

Increase

19
Q

You hear 2 musical notes. They both have the same pitch, but the first is louder than the second. If you compare the sound waves of each sound, what aspect(s) of the wave (wavelengths, frequency, speed, and amplitude) would be the same? What aspect(s) would be different?

A

Same - wavelengths, frequency, and speed

Different - amplitude

20
Q

The horn on your neighbor’s car is stuck, so it is constantly blaring. You watch your neighbor get into your car and drive away from you, heading toward the nearest place to fix it. compare the pitch of the horn before he starts to drive away to the pitch you hear as he is driving away form you.

A

it gets lower.

21
Q

You are riding your bicycle toward a stationary police car with a siren that is blaring away. Will the pitch of the siren sound lower, higher, or the same as it will sound when you actually stop your bicycle? ( Assume the actual pitch of the siren stays constant.).

A

higher.

22
Q

You are standing near an interstate highway trying to talk on your phone. You have raised your voice because of the noise, so the loudness of your voice is about 80 decibels. The sound of the traffic on the highway is about 100 decibels. How many times larger is the intensity of the traffic’s sound waves as compared to those of your voice?

A

100 decibels / 1 * 0.1 bels / 1 decibels = 10 bels
80 decibels / 1 * 0.1 bels / 1 decibels = 8 bels
10 - 8 = 2 10 * 10 = 100 times larger

23
Q

An amplifier cam magnify the intensity of sound waves by a factor of 1,000. If a 30-decibels sound is fed into the amplifier, how many decibels will come out?

A

30 decibels/1 * 0.1 bels/1 decibels = 3 bels + 3 bels (1,000 = 10 * 10 * 10 = 3) = 6 bels = 60 decibels

24
Q

What are Hz?

A

It’s short for Hertz or m/sec

25
Q

Sonic

A

20-20,000Hz

26
Q

Infrasonic

A

Below 20Hz

27
Q

Ultrasonic

A

Above 20,000

28
Q 
Crests
Troughs 
Wavelengths
Amplitude 
Frequency
A

Crests- the highest point in a wave
Troughs - the lowest point in a wave
Wavelengths - distance between the crests or the troughs
Amplitude - the hight of a wave
Frequency - how many times I wave hits a certain point every second

Phisical Science Quarter 4 (4 decks)

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