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?

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?

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?

Two earthquake waves of the same frequency travel through the same portion of the Earth, but one is carrying 3.5 times the energy. What is the ratio of the amplitudes of the two waves?