1 / 10

Superposition and Interference

Superposition and Interference. Review of Superposition. Two sound waves arriving at the same point P:. Pressure fluctuations. +. Pressure fluctuations. Resulting pressure fluctuation at P. Signal at P. p(t). time t. Signal at P: constructive interference. p(t). time t.

kathleen-aughmuty
Télécharger la présentation

Superposition and Interference

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Superposition and Interference

  2. Review of Superposition • Two sound waves arriving at the same point P: Pressure fluctuations + Pressure fluctuations Resulting pressure fluctuation at P

  3. Signal at P p(t) time t

  4. Signal at P: constructive interference p(t) time t The sound wave is enhanced Δt= 2τ Δt= 0 Δt= -τ When will this happen? Δt=n*τ n=…-2,-1,0,1,2,… any whole number

  5. Signal at P: destructive interference p(t) time t The sound wave is canceled out. Δt=-1/2*τ Δt=-τ-1/2*τ Δt=+1/2*τ When will this happen? Δt=(n+1/2)*τ n=…-2,-1,0,1,2,… any whole number

  6. Superposition • Constructive interference: The wave is enhanced if • Destructive interference: The wave is canceled if

  7. In space: Lines of constructive interference ΔL=nλ (maxima and minima arrive at same time at points on these lines)

  8. In space: Lines of destructive interference ΔL=(n+1/2)λ (maxima of one wave and minima of the other arrive at same time at points on these lines)

  9. Path length diffence How many rays are there coming from a point source? ΔL=1.5λ ΔL=0 Two rays traveling parallel.

  10. Better… • Use overhead projector for demonstration

More Related