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If two waves having amplitudes a and b make superposition the resultant amplitude A is given as A = 1 √(a 2 + b 2 + 2ab cosφ) where φ is phase constant. The intensity (I) 2 is directly proportional to square of amplitude. I α A 2 I.e. I α (a 2 + b 2 + 2ab cos φ ) In case of constructive interference cos φ = 2np. Imax = k (a + b) 2 While in case of destructive interference Imax = k (a – b) 2 Light wave from two coherent sources of intensity ratio 81 : 1 produce interference. Using these information choose correct answer in the following. 1. The ratio of maxima and minima in the interference pattern is. a) 9:1 b) 81 : 1 (C) 25 : 16 (D) 16 : 25 2. The ratio of amplitudes of light waves from two sources is (A) 1 : 4 (B) 4 : 1 (C) 2 : 1 (D) 1 : 2 3. (The ratio of amplitudes of two sources is (A) 9 : 1 (B) 81 : 1 (C) 1 : 9 (D) 1 : 81


 If two waves having amplitudes a and b make superposition the resultant amplitude A is given as  A = 1 √(a2 + b2 + 2ab cosφ) where φ is phase constant. The intensity (I)2 is directly proportional to  square of amplitude. I α A2 I.e. I α (a2 + b2 + 2ab cos φ ) 

In case of constructive interference cos φ = 2np. Imax = k (a + b)2

While in case of destructive interference Imax = k (a – b)2

Light wave from two coherent sources of intensity ratio 81 : 1 produce interference. Using these information
choose correct answer in the following.
 
1. The ratio of maxima and minima in the interference pattern is.
a) 9:1 b)  81 : 1 (C) 25 : 16 (D) 16 : 25
 
2. The ratio of amplitudes of light waves from two sources is
(A) 1 : 4 (B) 4 : 1 (C) 2 : 1 (D) 1 : 2
 
3. (The ratio of amplitudes of two sources is
(A) 9 : 1 (B) 81 : 1 (C) 1 : 9 (D) 1 : 81
 
 
 
 
 
 
 


Grade:11

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