During an investigation about sound, students place an alarm clock that is ringing in a Bell Jar as seen in the picture below. Prior to turning on the Bell Jar Pump (which removes the air from the jar) the teachers ask the students to predict what will happen. Each student gives an explanation: Student A: The sound will not be heard because the bell cannot move when all of the air in the bell jar has been removed. In order to hear sound, there must be a medium. Student B: The sound cannot be heard because sound requires a medium. While the bell is still moving, all the air has been removed and therefore there is no medium. Student C: The sound can be heard because the bell can move even though all of the air in the bell jar has been removed. In order to hear sound, there must be a medium and the bell is the medium Student D: The sound cannot be heard because sound requires a medium. Since there will be no air, the bell will not move and the moving of the bell requires air Which Student is Correct?(DOK 2)
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
During an investigation about sound, students place an alarm clock that is ringing in a Bell Jar as seen in the picture below. Prior to turning on the Bell Jar Pump (which removes the air from the jar) the teachers ask the students to predict what will happen. Each student gives an explanation:
Student A: The sound will not be heard because the bell cannot move when all of the air in the bell jar has been removed. In order to hear sound, there must be a medium.
Student B: The sound cannot be heard because sound requires a medium. While the bell is still moving, all the air has been removed and therefore there is no medium.
Student C: The sound can be heard because the bell can move even though all of the air in the bell jar has been removed. In order to hear sound, there must be a medium and the bell is the medium
Student D: The sound cannot be heard because sound requires a medium. Since there will be no air, the bell will not move and the moving of the bell requires air
Which Student is Correct?(DOK 2)
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