9 Wave phenomena

Question 1

List simple characteristics of harmonic motion.

Answer 1

X

Question 2

Describe the mass spring system and simple pendulum.

Answer 2

Mass Spring system:

Simple pendulum:

Question 3

Describe a Mass spring system.

Question 4

Simple pendulum

Question 5

Consequences of the defining equation.

Simple harmonic motionn

Question 6

Single-slit diffraction

Describe when sinlge slit diffraction takes place!

Answer 6

Diffraction takes place when a wave of wavelength λ is incident on an aperture whose openinng size is b.

Question 7

Describe when single slit diffraction becomes visible.

Answer 7

Diffraction is appreciabble if the wavelength of light is of the same or bigger order of magnitude as the opening it shines through.

λ≧b.

Question 8

Is diffraction negligible when the wavelength is much smaller than the openings size.

λ

Answer 8

Only if the wavelength is much smaller than the opening

λ<

other wise there is still some importance to it.

Question 9

Describe the path diffrence given for a single slit.

(equation)

Answer 9

b/2 sin𝜽

Question 10

Describe the path diffrence for destructive interference.

(equation)

Answer 10

λ/2 =b/2sin𝜽

λ=bsin𝜽

Question 11

The minima (points of destructive interference) can be given by…

Answer 11

bsin𝜽 = nλ

where n = 1,2,3,4….

Question 13

Describe Constructive interference.

Answer 13

Constructive interference is the creation of bright bands through the light of two slits meeting.

Question 15

Resolution

Answer 15

Resolution of two objects means the ability to see as ditinct two objects that are distinct.

Answer 16

That when the two objects IS when the firs minimum defraction pattern consides with th

Question 17

What is the doppler effect?

Answer 17

The Doppler effect is the change in th eobserved frequency of a wave which happens whenever there is relative motion between the source and the observer.

Question 18

How does a moving source of sound waves affect the stationary observer?

Answer 18

If the observer is stationary but the source movestoward the observer at a speed vs, the observer still intercepts more waves per second and the frequency goes up. This time it is the wavelength of the wave received by the observer that is effectively shifted by the motion, rather than the speed.

Question 19

How to calculate the wavelength of a moving source from a stationary point.

Answer 19

λ=(v-u)/f

Question 20

What does this equation λ=(v-u)/f mean for the equation of the frequency measured?

Answer 20

It means that the equation for the frequency is equal to

f¹=v/λ¹

f=v/((v-u)/f)