# 2 point sources vibrate in phase at the same frequency. They set up an interference pattern in which a point on the 2nd nodal line is 29.5cm?

from one source and 25cm from the other. The speed of the waves is 7.5cm/s.

a) Calculate the wavelength

b) Calculate the frequency at which the sources are vibrating.

### 1 Answer

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- jacob sLv 74 weeks agoFavourite answer
Nodal line = minima

for second Nodal line

total path difference = 3λ/2

(29.5 -25) = 3λ/2

λ = 3 cm

a) wavelength = 3 cm

b) f = v/λ = 7.5/3 = 2.5 Hz

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