When a 400HZ tuning fork is played with a mystery frequency, 7 beats per second are heard. When a 410HZ tuning fork is played with the same mystery frequency, 3 beats per second are heard. What is the mystery frequency?
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- A string experiences several harmonic frequencies. Two successive frequencies are 325Hz and 390Hz. a) What is the fundamental frequency? b) What is the next harmonic higher than 195Hz? c) Which harmonic is this?A sound wave travels through air at 20 °C. The decibel level at a distance of 19.4 m from the source is measured to be 85.2 dB. What is the dB level at a position that is 7.17 m closer? Assume the density of air is 1.20 kg/m3 and that the source produces spherical wave fronts.You are trying to tune the A on your piano and you have a 440Hz tuning fork. The string is still slightly out of tune. How can you tell? (Describe what you would hear and name for this phenomenon.)
- The sound coming from 25 W spherical speaker has a decibel level of 90 dB. How far away is the speaker?A speaker is producing spherically symmetric sounds with a total power of 88.5 W. If the speaker is located at the centre of a sphere with a radius of 2.20 m, what is the power received on a 1.70 m by 1.50 m area on the sphere? Give your answer in Watts to 2 decimal places.A weather emergency siren is mounted on a tower, 153 m above the ground. On one hand, it would be a good idea to make the siren very loud so that it will warn as many people as possible. On the other hand, safety regulations prohibit the siren from exceeding an intensity level of 101 dB for workers standing on the ground directly below the siren. Assuming that the sound is uniformly emitted, what is the maximum power that the siren can put out? maximium power output: 3530 W Incorrect How far away from the base of the tower can a person be and still be able to hear the siren? Neglect any absorption of sound energy by the air; although, in reality, such absorption would be significant at long distances. maximum audible distance: 16733.2 Incorrect about us privacy policy terms of use help careers contact us
- Problem 1: A speaker emits 40 W of 1000 Hz while at rest. a) If you receive 100 dB from the speaker, how far away from it are you? Answer: 17.8 m b) If you hear the speaker frequency to be 1100 Hz, what is the relative velocity between you and the speaker, and are you moving toward or away from it? Answer:|v| = 34.3– т San ambulance is approaching you at 22 m/s, sounding its siren at a frequency of 675 Hz? If the speed of sound is 344 m/s , what frequency do you observe? Your velocity is 0 m/s.In each of the four scenarios shown in the images, a large bat lets out a short burst of ultrasonic sound, which a smaller bat hears a moment later. If the large bat flies at 2.320 m/s and the small bat flies at 13.80 m/s, order the frequencies that the smaller bat detects in the four scenarios from highest to lowest. Assume that the speed of sound is 343.0 m/s. Highest frequency A D B. A B C Lowest frequency Answer Bank In Scenario C, part of the large bat's signal reflects off the small bat and returns to the large bat, warning it of the smaller bat's presence. If the initial signal has a frequency of 66.70 kHz, what return frequency fr will the large bat detect? Calculate the final frequency to four significant figures. fr Incorrect kHz Ꭰ
- Example M 500 High Rings for some time before dying out. A tuning fork with Q = 1000 is struck, producing a sound at 1 m of 60 dB with a frequency of 440 Hz. How loud is the sound after 10 seconds...? Q=1/4 A(t) = Age-t 入A fuel-efficient car is able to convert the chemical potential energy of gasoline into translational kinetic energy at an efficiency of 78.4%. If there is 8742 kJ of chemical potential energy in one tank of gas, what is the amount of translational kinetic energy produced. How to manipulate formula eff=output/input x 100A weather emergency siren is mounted on a tower, 153 m above the ground. On one hand, it would be a good idea to make the siren very loud so that it will warn as many people as possible. On the other hand, safety regulations prohibit the siren from exceeding an intensity level of 101 dB for workers standing on the ground directly below the siren. Assuming that the sound is uniformly emitted, what is the maximum power that the siren can put out? maximium power output: W * TOOLS х10 How far away from the bas and still be able to hear the siren? Neglect any absorption of sound energy by the air; although, in reality, such absorption would be significant at long distances. maximum audible distance: m