Two periodic waves of intensities I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is:

1.  2l1+l2

2.  I1+l22

3.  I1-l22

4.  2I1-l2

Subtopic:  Superposition Principle |
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Level 2: 60%+
AIPMT - 2008
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