t (s) 4 2 FIGURE Q15.25
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You stand at x = 0 m, listening to a sound that is emitted at frequency fs. as shown the frequency you hear during a four-second interval. Which of the following describes the motion of the sound source?
A. It moves from left to right and passes you at t = 2 s.
B. It moves from right to left and passes you at t = 2 s.
C. It moves toward you but doesn’t reach you. It then reverses direction at t = 2 s.
D. It moves away from you until t = 2 s. It then reverses direction and moves toward you but doesn’t reach you.
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- Name 12. A radio speaker produces a loud sound that is heard by two people: a person sitting on a bench near the speaker, and a driver in a truck, The driver perceives the sound at a lower pitch than the person sitting on the bench. Which of the following best explains why the driver perceives the pitch of the sound to be lower? A. The driver is not close to the speaker. B. The driver is not moving fast enough. C. The driver is moving away from the speaker. D. The driver has the windows of the truck closed. 13, The table below shows characteristics of four sound waves. Characteristics of Four Sound Waves Frequency (Hz) Wavelength Intensity (m) Speed (m/s) Sound Wave (dB) W 160 2.13 80 341 264 1.29 120 341 Y 396 0.86 100 341 898 0.38 60 341 Based on the information in the table, which wave has the longest period? A. wave W B. wave X C. wave Y D. wave ZA traveling wave is represented by a wave function y(x, t)= (5.0 cm) sin (x-(0.20 m/s)t). When 3.0 m' t= 0 s, the first crest of this wave function on the positive side of the x coordinate origin is located at a. 0.25 m. b. 0.75 m. c. 1.50 m. d. 3.0 m. 3.0 m.You drving in car 1 and your friend is drving in car 2 playing music at a frequency f. Van V is also driving on the same road. 1) Write an equation for the frequency you will hear generated by your friend and bounced off the van. Express the frequency you heard in terms of f. v car 1 = 100.0 km/h v car 2 = 80.00 km/h v van V = 60.00 km/h
- please quickly thanks ! You have two mono-frequency sound sources. If you set one frequency as 600Hz, and sweep another frequency from 597Hz to 603Hz, what will happen to the sound intensity you measure? A.It varies, and the interval of this variation will gradually become shorter before half of the sweeping time, then gradually longer in the rest time. B.It varies, and the interval of this variation will gradually become shorter. C.It doesn't change at all. D.It varies, and the interval of this variation will gradually become longerPart 1: Trains with passengers A railroad train is traveling at 34.2 m/s in still air. The frequency of the note emitted by the train whistle is 220 Hz. The air temperature is -9°C. A.) What frequency is heard by a passenger on a train moving in the opposite direction to the first at 35.8 m/s and approaching the first? B.) What frequency is heard by a passenger on a train moving in the opposite direction to the first at 35.8 m/s and receding from the first?Two trucks pass each other in opposite directions, one of them beeping its horn at frequency of 540HZ. What is the wavelength of the horn by the other driver before crossing each other? [velocity of either truck is 75km/h and that of sound is 332m/s] A. 0.65m B. 1.53m C. 398m D. 0.83m A O со DO B O DELL FO F10 F11 tes. R D F G B N T Alt
- If you are playing a non-harmonic or percussion instrument and you change the number of overtones of a note, you will: A. Make the pitch sound higher. B. It is hard to say because most percussion instruments don’t have a strong sense of pitch in the first place. C. Change the pitch of the note. D. Lose all sense of pitch.5. A quantum object travels directly toward you at a constant rate while producing a sound with a singular frequency of 440 Hz. While you stand still, the object passes through you and continues Moving (you are uninjured). You measure an overall shift in the frequency you hear to be 25.0 Hz. Assume is it 20.0 °C during this shift. a) What is the speed of this particle? b) After is passes through you, you notice that your wallet is missing and see it attached to this particle. You begin accelerating toward the particle at a constant rate of 1.50 m/s² via ion propelled roller shoes. At what time do you perceive a frequency of 435 Hz? c) You stop accelerating when you perceive a frequency of 435 Hz and continue to travel at a constant rate at which time the particle then instantaneously reverses it path to return your wallet, traveling back toward you at its same constant rate which it initially had. What frequency do you then perceive at it travels toward you?Determine the intensity of a 119-dB sound. The intensity of the reference level required to determine the sound level is 1.0×10−12W/m2. A. Express your answer to two significant figures and include the appropriate units. B. Determine the intensity of a 21-dBsound. Express your answer to two significant figures and include the appropriate units.
- A transverse wave is traveling left to right. Which of the following is correct about the motion of particles in the wave? a. The particles move up and down when the wave travels in a vacuum. b. The particles move left and right when the wave travels in a medium. c. The particles move up and down when the wave travels in a medium. d. The particles move right and left when the wave travels in a vacuum.49. What will most likely happen to a ringing bell if placed inside a bell jar connected to a vacuum pump? A. The sound intensity will increase.B. The sound intensity will decrease.C. Frequency of the sound will decrease.D. The speed of sound will increase.a. Explain how sound waves are propagated through air. Are these longitudinal or transverse waves? b. Describe the motion of individual air molecules at a node and at an antinode. Compare this to the motion of the individual spring coils at nodes and antinodes when a standing wave is produced in a slinky. c. What is the effect of changing the frequency of the sound? Does it change the velocity of the wave? Does it change the wavelength?