Solve the following problems.

1. The sound intensity perceived from a point source is 0.50 W/m^2 when at a distance of 5.0 m. What is the power output of the point source?
2. The intensity of a sound wave is 6.0 10 -6 W/cm^2 . If you increase the sound level of the sound wave by 10 decibels, what is the new intensity?
3. Given that sound wave A has an intensity 100 times greater than sound wave B, what is the difference of the sound level between the two?
4. If you increase the sound level of a source by 10 dB, by what factor does the intensity increase?
5. A microphone can absorb 1.1 mW of sound on a surface area of 2.0 cm^2 . Calculate the intensity of the sound entering the microphone.

Solve the following problems

Items 4-6. A girl is riding a car at a constant speed of 50 m/s and a stationary source of

sound is being produced by a flute player. If the flute player produces a pitch of 440 Hz,

4. What will be the frequency perceived by the girl if she moves toward the flute player?

5. What will be the frequency perceived by the girl if she moves away from the flute player?

6. What is the total change in frequency heard by the girl as she passes toward then away from the flute player?

Items 7-10. A thief riding a stolen car and moving at 45 m/s is being chased by a police

car moving at 15 m/s. If the police car produces a sound from its siren at a frequency of 300 Hz,

7 . What is the frequency being perceived by the car thief?

8. If instead, the car thief was the one producing the sound at 300 Hz from a loudspeaker, what is the frequency that the police officer hears from his police car?

9. If the police officer finally catches up to the car thief at 45 m/s, what would be the frequency perceived by the car thief?

10. If the car thief increases his velocity to 50 m/s while the police officer i s at 45 m/s, what is now the perceived frequency of the car thief from the siren?