Two waves of amplitude 5 mm and 7 mm reach a point in opposite phase. What is the resultant amplitude?
(1) 2 mm (2) 4 mm (3) 6 mm (4) 8 mm

Question

Two waves of amplitude 5 mm and 7 mm reach a point in opposite
phase What is the resultant amplitude?
(1) 2 mm (2) 4 mm (3) 6 mm (4) 8 mm

Shobhit Mittal · Accepted Answer

Dear Student,

if the phase are just opposite then the minimum will be come 
the minimum value is =7-5=2mm
this can be proof by =49+25+2*7*5cos180=49+25-2*7*5=4=2 mmRgards

Two waves of amplitude 5 mm and 7 mm reach a point in opposite phase. What is the resultant amplitude? (1) 2 mm (2) 4 mm (3) 6 mm (4) 8 mm

Two waves of amplitude 5 mm and 7 mm reach a point in opposite phase. What is the resultant amplitude?
(1) 2 mm (2) 4 mm (3) 6 mm (4) 8 mm