Physics little help

[no.mercy]

Hey guys can you explain me how to find the answer of the first part of the question..ThankYou!

 

[ismailmz]

a. Well i guess The path differene is 90 degree ....
b. Destructive interference.

 

[CoNfUsEd1]

a. 180 degrees
b. destructive interference

 

[no.mercy]

a. 180 degrees
b. destructive interference

Thanks for your reply but can you explain me how you got to your answers..thats why i said EXPLAIN..thank you

 

[izzahzainab]

we consider the wavelength of one wave to be 360 degrees. notice that the crest of 2nd wave is HALF wavelength away from the crest of first wave. so the phase difference is 180 degrees. Thats how i percieve this