As the phase difference between two interfering waves changes from 180° to 0°, the amplitude of the resultant wave A) Decreases
B) Increases
C) Remains the same

decrease

Explanation:

because it’s going to 180 meaning it’s becoming equal to the other and they cancel out

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000

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