18. Waves & Sound

Unpolarized light of initial intensity $I_0$ passes through two ideal polarizers. The transmission axis of the first polarizer is vertical, and the second is oriented at an angle $\theta$ with respect to the vertical. What is the intensity $I_2$ of the light after passing through both polarizers?

Which best describes how wave $I$ntensity and $L$oudness are typically related?

Which term describes the height of a sound wave?

You measure the intensity from a sound source to be 0.3 W/m² at a distance of 3.4 m. What will the intensity be if you walk closer to the source, to a distance of 2.5 m?

How does increasing the amplitude of a sound wave affect the volume (loudness) of the sound?

Which of the following changes would result in an increase in $I$ (wave intensity)?

Which property of a light wave determines its brightness?

A sound source radiates sound waves in all directions. At a distance of 4 m from the source, you measure the wave intensity to be 0.06 W/m². How much sound energy does the source emit in 1 hour if the power output is constant?