18. Waves & Sound
Sound Intensity
18. Waves & Sound
Sound Intensity
04:25
Practice this topic
- Multiple Choice
A source emits a sound in the shape of a cone, as shown in the figure below. If you measure the intensity to be 100 W/m2 at a distance of 0.5 m, what is the power of the source?
585views3comments - Multiple Choice
A source emits sound spherically with a power of 2.2 × 104 W. What is the minimum distance away from this sound that would be considered safe (a volume of 150 dB or less)?
519views3rank4comments - Multiple ChoiceSuppose an explosion can just be heard over normal conversation with an intensity of from 10 km away. At what distance from the explosion will the sound have an intensity that causes pain ()? Note that this calculation ignores absorption of sound energy by air and objects.378views1rank
- Multiple ChoiceA speaker at a rock concert is causing you pain, so you reason the sound level must be 130 dB. The speaker is 11 m away from you. To what final distance from the speaker should you move for the sound level to reach a less-painful 105 dB? Keep in mind that we are ignoring absorption of sound energy by air and objects.354views
- Textbook Question(a) By what factor must the sound intensity be increased to raise the sound intensity level by 13.0 dB? (b) Explain why you don't need to know the original sound intensity557views
- Textbook QuestionA baby's mouth is 30 cm from her father's ear and 1.50 m from her mother's ear. What is the difference between the sound intensity levels heard by the father and by the mother?487views
- Textbook QuestionFor a person with normal hearing, the faintest sound that can be heard at a frequency of 400 Hz has a pressure amplitude of about 6.0 * 10-5 Pa. Calculate the (a) intensity773views1comments
- Textbook QuestionYou live on a busy street, but as a music lover, you want to reduce the traffic noise. (b) If, instead, you reduce the intensity by half, what change (in dB) do you make in the sound intensity level?475views1rank