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Acoustics Answers

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Is it defying physics to hear a conversation through a glass front building, while outside? If there aren't any other outside noises interfering, and the building is a small cabin-like structure, where four people crowds it? If it is possible, how far would the sound wave travel?
When the speed of a source is less than the speed of sound in a medium, the wavefront of the wave is –
A) Cylindrical B) Spherical C) Conical D) Plane

When the speed of a source is GREATER than the speed of sound in a
medium , the wavefront of the wave is –
A) Cylindrical B) Spherical C) Conical D) Plane

When the speed of a source is EQUAL to the speed of sound in a medium, the wavefront of the wave is –
A) Cylindrical B) Spherical C) Conical D) Plane
When the speed of a source is less than the speed of sound in a medium , the wavefront of the wave is –
A) Cylindrical B) Spherical C) Conical D) Plane

When the speed of a source is GREATER than the speed of sound in a medium , the wavefront of the wave is –
A) Cylindrical B) Spherical C) Conical D) Plane

When the speed of a source is EQUAL to the speed of sound in a medium , the wavefront of the wave is –
A) Cylindrical B) Spherical C) Conical D) Plane

Please answer with explanation.

There are speakers that are separated by .650m and are playing a note having a frequency of 676 hz. If your lounge chair is located in a line directly in front of one of the speakers, how far from that speaker should it be for you to be located at the first maximum intensity. The speed of sound in the room is 343 m/s.
How do I determine the air pressure emitted from a speaker ? And how to determine the velocity of air from the sound air pressure ?
calculate the percent error made over one mile of distance by the 5 sec.rule for estimating the distance from a lighting strike if the temperature (a) 300 c (b) 100 c
a person , with his ear to the ground , see a huge stone strike the concrete payment. a moment later two sounds are heard from the impact. one travels in the air and the other in the concrete, and they are 1.1 is apart. how far away did the impact occur?
Why does the graph of static and kinetic friction slant upwards at one part and the levels out. Also what will happen if a 135N is used?
A catapult accelerates a rock from rest to a velocity of 15.0 m/s [S] over a time interval of 12.5 s. What is the rocks average acceleration.
hello sir please help me to find my ans. in esy steps.
my que. is :

Area of a windows is 2 m^2 & the intensity level at the open windows is 80 dB. then, how much acoustic power enters the room ?

please reply too soon. thnk u.