Reflection and Rarefaction

Question 1

Wave - How it acts/Behaviour

Answer 1

Mechanical Waves carry energy through a medium.
Changes occur when mechanical waves meets a new medium with either changes in temperature or density or a whole different material.

1.Reflection - The wave bounces off the new medium
2.Transmission - The wave starts moving through the new medium
3.Absorption - The wave’s energy is absorbed by the new medium as heat.

Question 2

Waves Front and Rays

Question 3

Reflection

Answer 3

When a reflected sound reaches your ears more then 0.1seconds after you hear the original sound, you hear the reflected sound as an echo.

When the time interval is less then 0.1 seconds your brain interprets the waves as a single sound, the overlapping of sound waves is known as reverberation.

Question 4

Speed of Sound and Light

Answer 4

Sound waves travel when there is a smaller distance between the particles in the medium. As a result, it travels fastest in solids and slowest in gases.

For light as the density increases the speed of light also decreases.

Speed of sound is also affected by temperature, higher the temperature = higher kinetic energy meaning particles are moving faster and therefore energy will be transferred more quickly.

Question 5

Refraction:

Answer 5

When a wave moves from 1 medium to another and its velocity changes then:
1.The frequency will the same.
2.The wave length will change due to a change in velocity.(As frequency is kept the same, however as velocity changes wavelength will also change).
3.If the wave enters the new medium at an angle, it refracts and changes direction.

The reason is refracts is because as part of the wavefront reaches the boundary, it first slows down or speeds up, while the remainder of the wave is still in its original velocity.

Question 6

Rarefaction of sound

Question 7

Rarefaction of Sound Applications