1) Two waves of equal amplitude and frequency meet in phase. What type of interference occurs? a) Destructive b) Constructive c) Diffraction d) Refraction 2) Two waves meet out of phase by 180°. The resulting wave amplitude is.. a) Maximum b) Double the original c) Zero d) Half the original 3) Which condition is required for constructive interference? a) Path difference = (n + ½)λ b) Path difference = nλ c) Frequency = 0 d) Amplitude = 0 4) Two sound waves of equal amplitude meet exactly out of phase. What happens to the sound intensity? a) Increases b) Decreases c) Becomes zero  d) Remains same 5) In a diagram showing two crests meeting, what phenomenon is demonstrated? a) Destructive interference b) Constructive interference c) Diffraction d) Refraction 6) Two waves traveling in the same medium combine to produce a wave of amplitude equal to the sum of their amplitudes. This is called: a) Diffraction b) Polarization c) Refraction d) Constructive interference 7) When two coherent light waves meet in phase, the brightness at the point is.. a) Minimum b) Maximum  c) Zero d) Half the maximum 8) Two waves of equal amplitude interfere and the resultant amplitude is zero. Which condition is satisfied? a) In phase b) Same frequency c) Same wavelength d) Out of phase by 180° 9) Destructive interference occurs when the path difference between two waves is.. a) nλ b) 2nλ c) (n + ½)λ d)  λ/4 10) Two waves meet and cancel each other completely. Which condition is true? a) Amplitudes are unequal b) Waves are in phase c) Waves are out of phase d) Frequency is different

Demonstrate constructive and destructive interference of waves

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