Explain why an object must be elastic in order for waves to travel through it. W

Question

Explain why an object must be elastic in order for waves to travel through it. When are wavelength and frequency inversely proportional to one another and when are they not? Waves from two different sources traveling in the same medium meet at a certain location. They have the same frequency and wavelength but travel different distances to arrive at their meeting point (1) If the difference in their travel distances is equal to a whole number of their wavelengths will they interfere constructively or destructively? Explain. (2) If the difference in their travel distances is equal to a half number of their wavelengths will they interfere constructively or destructively? Explain. Define resonance and repeated reinforcement and use them to explain how- opera vocalists can break wine glasses by singing. A wave transfers (moves) energy through a medium. Explain how.

Explanation / Answer

4a)

As the wave passing through the medium, the medium particles gets disturbed, once the wave passed through a such a medium particles they come back to their intial state this is known as elastic behaviour of medium.

b)

Frequency is alway inversely proportional to wave length

c) two sources are called coherent source

1)

the distance travelled by two waves are differ by integral multyple of wave length hence interference is called constructive interference

phase difference between two waves is 0 or 2npi

2) the distance travelled by two waves are differ by integral multyple of half wave length hence interference is called distructive interference

phase difference between two waves isw (2n+1)pi

d)

Resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at a specific preferential frequency.

For example, wine glasses are especially resonant because of their hollow, tubular shape. If you flick a wine glass with your finger, you will hear a ringing sound.

If a singer sings the same musical note that matches the resonant frequency of the glass, the sound waves will vibrate the air particles around the glass at its resonant frequency. This will make the glass begin to vibrate, too. If a singer sings loudly enough, the vibrations can cause the glass to vibrate so hard that the glass shatters under the strain. so that the glass will break

e)

Waves are said to be an energy transport phenomenon. As a disturbance moves through a medium from one particle to its adjacent particle, energy is being transported from one end of the medium to the other. In a slinky wave, a person imparts energy to the first coil by doing work upon it. The first coil receives a large amount of energy that it subsequently transfers to the second coil. When the first coil returns to its original position, it possesses the same amount of energy as it had before it was displaced. The first coil transferred its energy to the second coil. The second coil then has a large amount of energy that it subsequently transfers to the third coil. When the second coil returns to its original position, it possesses the same amount of energy as it had before it was displaced. The third coil has received the energy of the second coil. This process of energy transfer continues as each coil interacts with its neighbor. In this manner, energy is transported from one end of the slinky to the other, from its source to another location.

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