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Boundary Behavior of Waves and Polarization AP Physics 2 MCQ

Boundary Behavior of Waves and Polarization AP  Physics 2 MCQ – Exam Style Questions etc.

Boundary Behavior of Waves and Polarization AP  Physics 2 MCQ

Unit 14: Waves , Sound , and Physical Optics 

Weightage : 15–18%

AP Physics 2 Exam Style Questions – All Topics

Exam Style Practice Questions ,Boundary Behavior of Waves and Polarization AP  Physics 2 MCQ

Question

A longitudinal wave is travelling through a medium. The variation with distance d of the displacement x of the particles in the medium at time t is shown.
Which point is at the centre of a compression?

▶️Answer/Explanation

Ans:A

Suppose three molecule at closest to A and C.

A – Compress

B- Normal pressure point

C- Rarefraction

D- Normal pressure point

Question

Unpolarized light with an intensity of 320Wm−2 goes through a polarizer and an analyser,   originally aligned parallel.

   

       What is the intensity of the light emerging from the analyser?

        A. 120Wm-2
        B. \(80\sqrt{3}Wm^{-2}\)
        C. 240Wm-2
        D. \(160\sqrt{3}Wm^{-2}\)

Answer/Explanation

Ans:  A

Intensity of light transmitted by \(  P_{1}=\frac{320}{2}=160 \)

Angle between \( P_{1} \) and  \(  P_{2}=30^{\circ} \) (given)
According to Malus law of Intensity of light transmitted by\( P_{2} \)  ⇒ \(  i_{2}=i_{1}\cos ^{2}30^{\circ}   \)   ( where \( i_{1}=60^{\circ} \) )   \( = 120^{\circ} \)

Question

Two identical waves, each with amplitude X0 and intensity I, interfere constructively. What are the amplitude and intensity of the resultant wave?

Answer/Explanation

Ans: D

For constructive interference (maximum intensity) :
Phase difference, φ = 2nπ and path difference = nλ where n = 0, 1, 2, 3, …
⇒  Amax = A1 + A2  and Imax = I1 + I2 +
Here \(A_1= A_2=X_0\)
 and \(I_1 =I_2=I\) as both waves are identical
putting this in equation we get
\(A_{max} = X_0 +X_0 =2X_0\)
and \(I_{max} = (2I)^2 = 4I\)
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