The Speed of Sound

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# The Speed of Sound - PowerPoint PPT Presentation

The Speed of Sound. How can you determine how far a thunder storm is away from you?. Speed of Sound. Much slower than the speed of light (values for air) Light – 300,000,000 m/s Sound – 332 m/s. Calculating Speed of Sound. Assuming no pressure change from atmospheric, V = 332 + 0.59T

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### The Speed of Sound

Speed of Sound
• Much slower than the speed of light (values for air)
• Light – 300,000,000 m/s
• Sound – 332 m/s
Calculating Speed of Sound
• Assuming no pressure change from atmospheric,

V = 332 + 0.59T

• The speed of sound in air at 0C is 332m/s, the speed increases by 0.59m/s for every degree celsius raised
Practice Question
• What is the speed of sound in this room?
Changing the Medium
• Sound can travel through solid, liquid or gas
• Speed of sound depends on three things:
• Density of particles
• Closer particles are together – faster vibration can travel
• Gas – slow, solid – fast
• Sound travels faster on a humid day

Temperature of Particles

• Faster the particles move, the quicker the vibration can be transferred
• Warm – Fast, Cold – slow
• Mass of the Particles
• Heavier the particles, the slower the vibration travels
Questions:
• Calculate the speed of sound if the temperature is: a) 1C b) 30C c) -10 C
• If the frequency of a radio wave is 102.1Mhz and the temperature of the air outside is 15C, what is the wavelength of the radio wave?
• A student is located 100m away from the school’s bell. If the bell rings, how long will it take the sound to reach the student’s ear if the temperature outside is -15 C?
• A swimmer is under the water while their friend is on the shore. If they are both the same distance away from a boat that is approaching, who will hear the boat first?
• Will sound travel faster at sea level or at the top of a mountain? The equator or the north pole? Explain.
Reflection of Sound
• Echoes – sound that reflects off a barrier and returns to the source
• Only use the following formula for echoes:

v = 2d/t

V – speed of sound

d – distance from source to reflective barrier

t – time for sound to return

Sonar

• Uses sound to detect things underwater
• Process called echolocation – by analyzing echoes (reflected sound) we can detect objects

Echolocation

• Bats and dolphins use echolocation to find prey and locate things around themselves