PHYSICS – Sound.

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Presentation transcript:

PHYSICS – Sound

LEARNING OBJECTIVES Core •Describe the production of sound by vibrating sources • Describe the longitudinal nature of sound waves • State that the approximate range of audible frequencies for a healthy human ear is 20 Hz to 20 000 Hz • Show an understanding of the term ultrasound • Show an understanding that a medium is needed to transmit sound waves • Describe an experiment to determine the speed of sound in air • Relate the loudness and pitch of sound waves to amplitude and frequency • Describe how the reflection of sound may produce an echo Supplement Describe compression and rarefaction State typical values of the speed of sound in gases, liquids and solids

Sound What is sound?

Sound is a series of waves (sound waves) caused by vibrations. What is sound? Sound is a series of waves (sound waves) caused by vibrations.

Sound is a series of waves (sound waves) caused by vibrations. What is sound? When a drum is struck, the skin vibrates backwards and forwards very quickly, sending sound waves through the air to your ears. Sound is a series of waves (sound waves) caused by vibrations.

Sound is a series of waves (sound waves) caused by vibrations. What is sound? When a drum is struck, the skin vibrates backwards and forwards very quickly, sending sound waves through the air to your ears. Sound is a series of waves (sound waves) caused by vibrations. Sound waves travel as a series of compressions and rarefactions through the air. They are longitudinal waves.

Eg. Sound Longitudinal Waves http://www.physicsclassroom.com/class/sound/Lesson-1/Sound-as-a-Longitudinal-Wave

Eg. Sound Longitudinal Waves Compression Rarefaction http://www.physicsclassroom.com/class/sound/Lesson-1/Sound-as-a-Longitudinal-Wave Compression Rarefaction

Eg. Sound Longitudinal Waves http://www.physicsclassroom.com/class/sound/Lesson-1/Sound-as-a-Longitudinal-Wave Compression Rarefaction In longitudinal waves the oscillations (vibrations) are backwards and forwards. The different sections are known as compressions and rarefactions.

Eg. Sound Longitudinal Waves http://www.physicsclassroom.com/class/sound/Lesson-1/Sound-as-a-Longitudinal-Wave Compression Rarefaction In longitudinal waves the oscillations (vibrations) are backwards and forwards. The different sections are known as compressions and rarefactions. The oscillations in longitudinal waves are in the direction of travel. Sound waves are longitudinal waves.

Sound Waves

Sound waves are longitudinal waves. Sound Wave – Key Fact Sound waves are longitudinal waves.

Sound Waves Sound Wave – Key Fact Sound waves need a medium (material) to travel through – they cannot travel through a vacuum (empty space)

Sound waves can travel through solids, liquids and gases. Sound Wave – Key Fact Sound waves can travel through solids, liquids and gases.

Sound travels at 330 metres per second (330m/s), or 760 mph. Speed of Sound Sound travels at 330 metres per second (330m/s), or 760 mph.

Sound travels at 330 metres per second (330m/s), or 760 mph. Speed of Sound Lightning travels much faster than the sound of thunder. Sound travels at 330 metres per second (330m/s), or 760 mph. A 3 second gap between the flash of lightning and the sound of thunder means that the storm is about a kilometre away.

Sound travels at 330 metres per second (330m/s), or 760 mph. Speed of Sound Lightning travels much faster than the sound of thunder. Sound travels at 330 metres per second (330m/s), or 760 mph. A 3 second gap between the flash of lightning and the sound of thunder means that the storm is about a kilometre away. The Speed of Sound: Depends upon the temperature of the air. Sound travels faster through hot air than through cold air.

Sound travels at 330 metres per second (330m/s), or 760 mph. Speed of Sound Lightning travels much faster than the sound of thunder. Sound travels at 330 metres per second (330m/s), or 760 mph. A 3 second gap between the flash of lightning and the sound of thunder means that the storm is about a kilometre away. The Speed of Sound: Depends upon the temperature of the air. Sound travels faster through hot air than through cold air. Does not depend upon the pressure of the air. If atmospheric pressure changes, speed does not.

Sound travels at 330 metres per second (330m/s), or 760 mph. Speed of Sound Lightning travels much faster than the sound of thunder. Sound travels at 330 metres per second (330m/s), or 760 mph. A 3 second gap between the flash of lightning and the sound of thunder means that the storm is about a kilometre away. The Speed of Sound: Depends upon the temperature of the air. Sound travels faster through hot air than through cold air. Does not depend upon the pressure of the air. If atmospheric pressure changes, speed does not. Is different through different materials. Eg. Fastest through solids, then liquids, then gases.

The Speed of Sound: Speed of Sound Lightning travels much faster than the sound of thunder. Sound travels at 330 metres per second (330m/s), or 760 mph. A 3 second gap between the flash of lightning and the sound of thunder means that the storm is about a kilometre away. The Speed of Sound: Depends upon the temperature of the air. Sound travels faster through hot air than through cold air. Does not depend upon the pressure of the air. If atmospheric pressure changes, speed does not. Is different through different materials. Eg. Fastest through solids, then liquids, then gases. Air (dry) at 0oC = 330m/s, water at 0oC = 1400m/s, concrete = 5000m/s

How could we calculate the speed of sound in air?

How could we calculate the speed of sound in air? SPEED = DISTANCE TIME

How could we calculate the speed of sound in air? SPEED = DISTANCE TIME 75 metres

How could we calculate the speed of sound in air? SPEED = DISTANCE TIME 75 metres 75 metres

How could we calculate the speed of sound in air? SPEED = DISTANCE TIME 75 metres 75 metres Time

How could we calculate the speed of sound in air? SPEED = DISTANCE TIME Speed = 150 333 m/s 0.45 75 metres 75 metres Time

Are particles needed for sound to travel?

Are particles needed for sound to travel?

Are particles needed for sound to travel?

Are particles needed for sound to travel? As the vacuum pump is switched on, air is drawn out of the bell jar. The bell begins to get quieter.

Are particles needed for sound to travel? As the vacuum pump is switched on, air is drawn out of the bell jar. The bell begins to get quieter. Eventually, all of the air particles will have been drawn out of the bell jar. We can see the bell ringing, but we can’t hear it

Are particles needed for sound to travel? Conclusions: Sound needs particles to travel. Sound cannot travel through a vacuum. Sound cannot travel through space, because there are no particles.

Will sound travel faster through a solid, liquid or gas?

Will sound travel faster through a solid, liquid or gas?

Will sound travel faster through a solid, liquid or gas? Sound travels faster through a solid because the particles are more densely packed together.

Will sound travel faster through a solid, liquid or gas? Concrete = 5000m/s, Water at 0oC = 1400m/s, Air (dry) at 0oC = 330m/s Sound travels faster through a solid because the particles are more densely packed together.

An echo is a reflected sound wave.

Echoes used for Navigation

A boat sends out a sound wave so that the captain can calculate the depth of water. The captain knows that the speed of sound in water is 1500 m/s Distance = speed x time

A boat sends out a sound wave so that the captain can calculate the depth of water. The captain knows that the speed of sound in water is 1500 m/s Distance = speed x time But don’t forget that the sound has travelled there and back so we will need to divide our answer by two to get the depth.

Depth of water = speed x time 2 Calculate the depth if: Speed (m/s) Time (s) 1 1500 0.2 2 1.1 3 0.5 4 1.6 5 2.1 6 0.8

Depth of water = speed x time 2 Calculate the depth if: Speed (m/s) Time (s) Depth (m) 1 1500 0.2 150 2 1.1 825 3 0.5 375 4 1.6 1200 5 2.1 1575 6 0.8 600

Using sound Radar Sonar Used to detect objects in air, eg. aircraft.

Using sound Radar Sonar Used to detect objects in air, eg. aircraft. Used to detect objects under water, eg. submarines

Seeing the sound Loudspeakers convert the signal from the signal generator into sound waves. The oscilloscope allows us to study the frequency and loudness of a sound. Signal generators can produce signals over a range of frequencies and of varying amplitudes.

Pitch (or frequency) A high pitch sound A low pitch sound. The shorter the wavelength of the wave on the trace; the higher the frequency of the sound. The more waves you can see, the higher the pitch/frequency.

The bigger the waves you can see, the louder the sound. Loudness A quiet sound A loud sound The larger the amplitude of the wave on the trace; the louder the sound. The bigger the waves you can see, the louder the sound.

So what is our range of hearing?

So what is our range of hearing? Humans Max 20,000 Hz Min 20 Hz

So what is our range of hearing? Bat Max 120,000 Hz Min 1,000 Hz

So what is our range of hearing? Dolphin Max 150,000 Hz Min 150 Hz

So what is our range of hearing? Dog Max 50,000 Hz Min 15 Hz

So what is our range of hearing? Cat Max 65,000 Hz Min 60 Hz

So what is our range of hearing? Ultrasonic cat scarer (20kHz – 30kHz

Ultrasound Ultrasound is any sound above the range of human hearing (i.e. above 20,000Hz)

Ultrasound Uses Industrial cleaning – eg. of circuit boards and teeth. Ultrasound is any sound above the range of human hearing (i.e. above 20,000Hz) Uses Industrial cleaning – eg. of circuit boards and teeth.

Ultrasound Uses Industrial cleaning – eg. of circuit boards and teeth. Ultrasound is any sound above the range of human hearing (i.e. above 20,000Hz) Uses Industrial cleaning – eg. of circuit boards and teeth. Breaking down kidney stones.

Ultrasound Ultrasound is any sound above the range of human hearing (i.e. above 20,000Hz) Uses 3. Industrial quality control.- eg. Detecting cracks in a metal.

Ultrasound Ultrasound is any sound above the range of human hearing (i.e. above 20,000Hz) Uses 4. Pre-natal scanning of a foetus 3. Industrial quality control.- eg. Detecting cracks in a metal.

Ultrasound Ultrasound is any sound above the range of human hearing (i.e. above 20,000Hz) Uses 4. Pre-natal scanning of a foetus 3. Industrial quality control.- eg. Detecting cracks in a metal. 5. Range and direction finding - SONAR

LEARNING OBJECTIVES Core •Describe the production of sound by vibrating sources • Describe the longitudinal nature of sound waves • State that the approximate range of audible frequencies for a healthy human ear is 20 Hz to 20 000 Hz • Show an understanding of the term ultrasound • Show an understanding that a medium is needed to transmit sound waves • Describe an experiment to determine the speed of sound in air • Relate the loudness and pitch of sound waves to amplitude and frequency • Describe how the reflection of sound may produce an echo Supplement Describe compression and rarefaction State typical values of the speed of sound in gases, liquids and solids

PHYSICS – Sound