Presentation on theme: "Can You Hear It? (Almost) Everything You Need to Know About Sound."— Presentation transcript:
Can You Hear It? (Almost) Everything You Need to Know About Sound
Sound is the movement of air. Sounds begin when something vibrates, or quickly moves back and forth. For example, a guitar string begins vibrating and a sound is produced. Another example- our vocal cords vibrate when we talk or sing. Sound carries energy. This is why loud sounds hurt our ears.
Sound travels through different materials at different speeds. Sound travels through solids faster than liquids or gases. Check out how fast sound travels through different materials: Air- 330 meters per second Water- 1,500 meters per second Wood- 4,000 meters per second Granite Rock- 6,000 meters per second
Sound goes through the ear canal, hits the eardrum and causes a vibration. The sound enters tubes in the inner ear. Then it travels through nerves to the brain.
Each sound has a different wavelength. A wavelength is the distance from one area of squeezed particles to another.
Every sound has a different frequency. Frequency is the number of times a sound source vibrates in one second. Frequency determines pitch, or how high or low a sound is. Fast vibration = high frequency = high pitch Slow vibration = low frequency = low pitch
Amplitude is the amount of energy in a sound wave. High amplitude = high loudness or volume