Two identical waves are produced by sources at points P and Q. The waves travel along different paths to reach point R, as shown.
Both waves have a wavelength of 6.0 cm. The waves are in phase at point R.
What is the phase difference between the waves as they leave points P and Q?
1 )
${0^ \circ }$
2 )
${60^ \circ }$
3 )
${90^ \circ }$
${120^ \circ }$
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