A-LEVEL PHYSICS: 3.3.2: Demonstrating Interference (SaveMyExams)

Question 1

lasers are good equipment to analyse diffraction & intensity patterns because they form light that is: (2)

Answer 1

-coherent
-monochromatic (same wavelength)

Question 2

the diffraction pattern produced by a laser on a screen is made up of: (2)

Answer 2

-areas of constructive interference (bright strips, fringes)

-areas of destructive interference (dark fringes)

Question 3

constructive interference of sound waves from 2 speakers:

Answer 3

occurs when the compressions & rarefactions from each wave line up, and the sound appears louder

Question 4

destructive interference of sound waves from 2 speakers:

Answer 4

occurs when a compression from 1 wave lines up with the rarefaction from the other. the 2 waves cancel out, so no sound is heard.

noise-cancelling headphones

Question 5

intensity of a wave is ______ to the energy transferred by the wave

Answer 5

proportional

I ∝ A^2