Reflection and Rafraction

Question 1

Reflection

Answer 1

The wave bounces off a new medium

Question 2

Transmission

Answer 2

The wave starts moving through the new medium.

Question 3

Absorption

Answer 3

The Wave’s energy is absorbed by the new medium as heat.

Question 4

Wavefronts:

Answer 4

Lines that correspond to the crest of the wave.
When close to the source, wavefronts are usually curved.
When the wave has travelled a long distance from its source, the wavefront is nearly straight and is called a plane wavefront.

Question 5

Reflection:

Answer 5

The normal is a imaginary line usually dotted, that is perpendicular to the surface.
Incident ray represents the wave that approaches the surface. It meets the surface at the base of the normal.
The angle of incidence is the angle between the incident ray and the normal.
The reflected ray represents the wave after it is reflected by the surface. It leaves the surface from the same point.
Angle of reflection is the angle between the reflected ray and the normal.
The law of reflection states that angle of incidence is equal to the angle of reflection.

Question 6

Echo

Answer 6

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

When the time interval is shorter, your brain interprets the wave as a single sound. This overlapping of the sound waves is known as reverberation.

Question 7

Refraction

Answer 7

When a wave moves from one medium to another, the velocity changes.

1.Frequency remains constant
2.Its wavelength changes
3.If the wave enters the new medium at an angle, it refracts(Changes direction).

Wavefronts refract because the part of the wavefront that reaches the boundary first slows down or speeds up, while the remainder of the wavefront still in the original medium continues at original speed.

Question 8

The Effects