100 Word Essay On Light And Sound Waves

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Sound is a form of energy. It is created when something vibrates and in turn causes the medium (water, air, etc.) around it to vibrate. Traveling longitudinal waves are vibrations in the air, which we are able to pick up with our ears. Sound waves are made up of regions of high and low pressure named compressions and rarefactions. Sound is a longitudinal wave in which the oscillations take place in the direction of the wave travel i.e. backwards and forwards rather than from side to side. The backwards and forwards displacement results in a sequence of compression and rarefactions. Sound waves cannot be transmitted through vacuum. The transmission of sound requires at least a medium to be present to carry on oscillations. Most of the sound…show more content…

The history of the guitar can be traced back to nearly over 3000-4000 years. The oldest guitar-like instrument that still exists today hails from Ancient Egypt. It was used by a singer to entertain the Egyptian queen Hatshepsut named Har-Mose. Although over the years many theories have surfaced on the origin of the instrument, it is a common claim that the guitar is an advanced from the lute, or even of the ancient Greek kithara. Musical instruments much like the modern guitar have been used during the course of history and by various cultures and peoples.
How sound is produced by that instrument: Guitars produce sounds when vibration occurs due to one or more of their strings being plucked. This vibration results in the vibration of the body of the instrument, creating sound waves in the air. The pitch of a guitar is influenced by the string's thickness, its length, the distance stretched, and the number of times it vibrates.
Explain the purpose of each part of the instrument: The main parts of a guitar are the body which includes the bridge, the neck which has the fret, and the head which has the tuning part of the guitar.
(Body) A guitar usually has 6 strings and which are named form bottom to top as EBGDAE .Each string has its own mass, tension, and material. The pitch of a vibrating string depends on four things. -The mass of the string: more massive strings take time to vibrate. On classical guitars, the


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1. Q: Which travels faster, sound or light?A: SoundB: Light-------------------------------------2. Q: Which can travel through a vacuum (space with no substance)?A: LightB: Sound-------------------------------------3. Q: Which type of waves are the longest?A: Radar wavesB: Radio wavesC: Visible LightD: Gamma Rays-------------------------------------4. Q: About how fast is sound?A: 100 feet per secondB: 500 feet per secondC: 1,100 feet per secondD: 10,000 feet per second-------------------------------------5. Q: About how fast is light?A: 1000 feet per secondB: 1000 miles per secondC: 10,000 miles per secondD: 186,000 miles per second-------------------------------------6. Q: What travels faster than light?A: microwavesB: nothingC: soundD: air-------------------------------------7. Q: What type of particles make up light?A: airB: atomsC: moleculesD: photons-------------------------------------8. Q: Which is not a primary color?A: redB: greenC: blueD: yellow-------------------------------------9. Q: What color do yellow and red make?A: greenB: blueC: orangeD: pink-------------------------------------10. Q: If you add red, yellow, and blue light together what color light do you get?A: whiteB: blackC: brownD: green-------------------------------------11. Q: If you add red, yellow, and blue paint together what color of paint do you get?A: whiteB: brownC: blackD: purple-------------------------------------12. Q: What is it called when light rays are bent when passing from one substance to the next?A: radiationB: extractionC: refractionD: pointillism-------------------------------------13. Q: If a wave has a short wavelength, what type of frequency does it have?A: highB: low-------------------------------------14. Q: If a wave has a low frequency, what type of wavelength does it have?A: longB: short-------------------------------------15. Q: What color does an object look that reflects light of all wavelengths in equal amounts?A: whiteB: blackC: redD: blue-------------------------------------16. Q: Which color of light has the longest wavelength?A: purpleB: blueC: greenD: red-------------------------------------17. Q: A lens does which of the following?A: Changes the direction of lightB: Makes an object appear smallerC: Makes an object appear largerD: All of the above-------------------------------------18. Q: When looking through a covex lens will an object appear larger or smaller?A: largerB: smaller-------------------------------------19. Q: When looking through a concave lens will an object appear larger or smaller?A: largerB: smaller-------------------------------------20. Q: What is different about the light that makes up a laser beam versus the light from a flashlight?A: Laser light has very little spreadB: Laser light is all the same wavelengthC: None of the aboveD: All of the above-------------------------------------21. Q: Which of the following is not an application for a laser?A: To generate light.B: To cut through concrete or steel.C: To amplify light.D: To re-attach a damaged eye retina.-------------------------------------22. Q: What color is an object the absorbs light of all wavelengths?A: whiteB: blackC: blueD: red-------------------------------------23. Q: Does sound travel faster through air or water?A: airB: water-------------------------------------24. Q: The more dense a material is the slower sound will travel through it?A: TRUEB: FALSE-------------------------------------25. Q: What is the Doppler Effect?A: When the volume of a sound changes as the object making the sound passes by you.B: The echo made from another object.C: When the frequency or pitch of a sound changes as the object making the sound passes by you.D: The sound made when an object go faster than the speed of sound.-------------------------------------26. Q: What is the unit of measure for the loudness of a sound?A: AmpsB: DecibelsC: HertzD: Meters-------------------------------------27. Q: About what frequency range can the average human hear?A: 2Hz to 200HzB: 200Hz to 2000HzC: 20Hz to 20,000HzD: 200Hz to 200,000Hz-------------------------------------28. Q: What is an echo?A: Sound waves with changing frequencies.B: Reflected sound waves.C: Amplified sound waves.D: The same as the Doppler Effect.-------------------------------------29. Q: The phase of the waves in laser light is the same?A: TRUEB: FALSE-------------------------------------30. Q: About how long does it take for light to travel from the sun?A: 2 secondsB: 30 secondsC: 8 minutesD: 1 hour-------------------------------------

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