Boundary Behavior of Waves and Polarization AP Physics 2 FRQ

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

Boundary Behavior of Waves and Polarization AP Physics 2 FRQ

Unit 14: Waves , Sound , and Physical Optics

Weightage : 15–18%

AP Physics 2 Exam Style Questions – All Topics

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 \( i_{1}=60^{\circ} \) ) \( = 120^{\circ} \)

Boundary Behavior of Waves and Polarization AP Physics 2 FRQ