Turn on thread page Beta
    • Thread Starter
    Offline

    13
    ReputationRep:
    I’m a bit confused about coherence.

    I know two sources are coherent if they have a constant phase difference, does that mean in the image below, all the waves are coherent?

    Even if the phase difference isn’t zero, are the waves still coherent as long as it’s constant?

    https://imgur.com/a/1jf5z
    Posted on the TSR App. Download from Apple or Google Play
    Offline

    16
    ReputationRep:
    Yes, as long as the phase difference isn't changing, the waves will remain coherent, provided they jave the same frequency.
    • Thread Starter
    Offline

    13
    ReputationRep:
    (Original post by Radioactivedecay)
    Yes, as long as the phase difference isn't changing, the waves will remain coherent, provided they jave the same frequency.
    So as long as the waves have the same frequency and same constant phase difference, they are coherent.
    Posted on the TSR App. Download from Apple or Google Play
    • Thread Starter
    Offline

    13
    ReputationRep:
    (Original post by JacobPowell)
    So as long as the waves have the same frequency and same constant phase difference, they are coherent.
    ... actually does the phase difference need to be same, it just needs to be constant? @radioactiveDecay
    Posted on the TSR App. Download from Apple or Google Play
    Offline

    11
    ReputationRep:
    Constant phase difference means every wave has and maintains its original phase angle throughout the course of their interactions

    That's a condition for coherence
    Posted on the TSR App. Download from Apple or Google Play
    • Thread Starter
    Offline

    13
    ReputationRep:
    (Original post by Onlineslayer)
    Constant phase difference means every wave has and maintains its original phase angle throughout the course of their interactions

    That's a condition for coherence
    So one wave could have a difference of 180 degrees, another 10 degrees and another 123 degrees, but as as long as it’s constant throughout, its coherent?
    Posted on the TSR App. Download from Apple or Google Play
    Offline

    11
    ReputationRep:
    (Original post by JacobPowell)
    So one wave could have a difference of 180 degrees, another 10 degrees and another 123 degrees, but as as long as it’s constant throughout, its coherent?
    Yes exactly so.

    In the mark scheme, if you dare say coherent waves must have equal phase angles, it's an automatic fail. one could even get arrested for that. hehehehe
    • Thread Starter
    Offline

    13
    ReputationRep:
    (Original post by Onlineslayer)
    Yes exactly so.

    In the mark scheme, if you dare say coherent waves must have equal phase angles, it's an automatic fail. one could even get arrested for that. hehehehe
    Hahah thanks for your help
    Posted on the TSR App. Download from Apple or Google Play
 
 
 

1,507

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should predicted grades be removed from the uni application process

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.