Lecture 7

Question 1

Luez’s Law

Answer 1

Angle of incident = angle of refraction; applied to specular reflectors

Question 2

(T/F) Oblique incidence gives reliable reflections and transmission

Answer 2

False, reflection and transmission is uncertain

Question 3

Definition of Refraction

Answer 3

Bending or change in direction of a beam of sound as it passes from one medium to another

Question 4

Requirements for Refraction (2)

Answer 4

1. Oblique incidence

2. Different propagation speeds between the media

Question 5

Snell’s Law

Answer 5

Calculate the angle of refraction

Question 6

Sine

Answer 6

Ratio of two sides of a triangle

Opposite/Hypotenuse

Question 7

Relationship between degree of refraction and difference in speeds between two media

Answer 7

Directly related

↑ difference in speed between 2 media, ↑ degree of refraction

Question 8

Equation for Snell’s Law

Answer 8

sine of refracted angle/sine of incident angle = prop. speed of medium 2/prop. speed of medium 1

Question 9

Velocity in medium 2 > velocity in medium 1

Answer 9

Refracted (transmission) angle > Incident angle

Question 10

Velocity in medium 2 < velocity in medium 1

Answer 10

Refracted (transmission) angle < Incidence angle