On a particularly foggy night, a boat travels due east at 10 m/s. there are safety lights, but with the low visibility, the captain opts to sound the horn for 3 seconds every 5 seconds. the captain hears a beat frequency on the third blast he watches his compass and turns hard port maintaining the turn. when he no longer hears the beat, he straightens out his heading.
1. what caused the beat frequency?
2. why did turning stop the beat?
3. what was the frequency of the beat assuming lsound = 350 m/s?

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

High schoolphysics 5+3 pts a neon light consists of a glass tube with metal wires at each end. when connected to a high-voltage source, the gas glows. if a fly lands on the glass tube, what will most likely happen? a) the fly will not feel a shock because the glass conducts any free electrons back into the gas. b) electrons will flow directly from the metal wires along the glass and shock the fly. c) the fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal. d) electrons that are moving through the gas will be conducted through the glass and shock the fly.

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.