12. In the end-of-semester party, two powerful loudspeakers, placed next to each other, are playing music. Olivia is 13.0 m away from the speakers, and the sound level at her position is 110 dB. a) What is the intensity of the sound at Olivia's position? b) What is the output power of the speaker? c) Determine the acoustic pressure received by Olivia, if the temperature is 30.0 "C and the density of air is 1.22 kg/m³. nlf of
12. In the end-of-semester party, two powerful loudspeakers, placed next to each other, are playing music. Olivia is 13.0 m away from the speakers, and the sound level at her position is 110 dB. a) What is the intensity of the sound at Olivia's position? b) What is the output power of the speaker? c) Determine the acoustic pressure received by Olivia, if the temperature is 30.0 "C and the density of air is 1.22 kg/m³. nlf of
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Transcribed Image Text:A pendulum will oscillate 53 times every minute (1 minute = 60 s) on Jupiter. The length of
he pendulum rod is 0.8 m.
a) What is the period of the pendulum on Jupiter?
b) Determine the acceleration of gravity on Jupiter.
c) What is the frequency of the pendulum on earth, where average value of
acceleration due to gravity is 9.81 m/s?
d) Find the length of the pendulum rod, if we want to adjust the period of the pendulum
to 1.0 s.
12. In the end-of-semester party, two powerful loudspeakers, placed next to each other, are
playing music. Olivia is 13.0 m away from the speakers, and the sound level at her position
is 110 dB.
a) What is the intensity of the sound at Olivia's position?
b) What is the output power of the speaker?
c) Determine the acoustic pressure received by Olivia, if the temperature is 30.0 °C and
the density of air is 1.22 kg/m³.
d) Olivia's friend turns off one of the speakers (so the output intensity reduced to half of
the original), what is the sound level hear by Olivia?
13. A bat was flying toward a beetle at 34.6 m/s while emitted 90000 Hz ultrasound to the beetle
to detect its location. The beetle was resting on a tree. The temperature is 23 °C.
a) Find the wave length of the ultrasound emitted by the bat.
b) Find the frequency of ultrasound wave received by the beetle.
c) Find the frequency of the ultrasound wave reflected back to the bat.
d) After the bat caught the beetle, it's resting on a tree. A moth flying away from the bat
to escape. The bat emitted 90000 Hz ultrasound wave to the moth and received 77830
Hz reflected back from the moth. Determine the speed of the moth.
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