Presentation on theme: " 1) Determine the wave speed of a wave that has a period of 3 minutes and a wavelength of 0.05 m. 2) How are electromagnetic and mechanical waves different?"— Presentation transcript:
1) Determine the wave speed of a wave that has a period of 3 minutes and a wavelength of 0.05 m. 2) How are electromagnetic and mechanical waves different? 3) Determine the period of a wave that has a wavelength of 5.51m and a wave speed of 21.78 m/s. 4) As wavelength of a wave increases, what happens to the wave’s frequency? 5) Does energy of a wave increase or decrease when the wave’s frequency increases?
Is a disturbance or vibration that travels through a medium as a longitudinal wave. Sound waves travels in all directions away from the sound source. › Move or vibrate the medium back and forth along the path the wave travels.
Starts with a vibration, then the vibrations cause the particles in the medium to vibrate, and they bounce back and forth as the wave travels through them.
Amplitude- Is related to how spread out the particles are in the compressions and rarefactions (Longitudinal Wave) Determines the loudness of sound.
Loudness- Perception of the energy of a sound or describes what you hear Measured in decibels (dB) Depends on 2 factors- › 1. Amount of energy it takes to make the sound › 2. Distance from the sound source The larger the amplitude, more than the energy and louder that sound is Intensity- Amount of energy a sound wave carries per second through an area. › Greater the intensity, louder the sound
Pitch- How high or low the sound seems to a person. › Depends on the frequency of the sound wave Pitch: › Higher the frequency, higher the pitch Measured in Hertz (Hz) People usually hear between 20 Hz and 20,000 Hz
Change in frequency of a wave as its source moves in relation to an observer. How this happens- › Frequency of a moving object is higher than if the object was not moving Frequency changes because the motion of the source adds to the motion of the waves › Example- Throwing a tennis ball at a wall while moving
Sound waves travel in all directions away from their source. › Ex: People in a gym hearing a radio playing The medium does not travel with the sound waves. › They only vibrate back and forth.
Travels at different speeds in different mediums Depends on 3 things- 1. Elasticity- Ability of a material to bounce back after being disturbed › How well the particles of the medium bounce back after they are disturbed › The more elastic the medium, the faster sound travels 2. Density- How much mass or matter there is in a given amount of space or volume › In the same state of matter, sound travels faster in less dense materials. 3. Temperature- The greater the temperature, the faster the speed of sound
The speed of sound- › Solid-Normally faster than Liquids and Solids › Liquids- Faster than gases › Gases-Slowest Subsonic- Objects that travel slower than the speed of sound › Helicopter Supersonic- Objects that travel faster than the speed of sound › Jet breaking the speed of sound
Occurs when sound waves combine in patterns that are pleasing. Sound Quality- Result of several pitches blending together through interference Resonance- Occurs when 1 object causes another object to vibrate at a natural frequency. Noise- Has no pleasing patterns.
Acoustics- Study of how sounds interact with each other and the environment › Used to design concert halls Reverberations- Multiple echoes that are produced when reflected sound and direct sound build up and blend together.
What is the function of your ears? Explain the function of the inner ear? What do sound waves make your eardrum do? Discuss what the cochlea is? Describe how vibrations move through the cochlea. What part of your body tells you that you have heard sound?