Physics, 28.06.2019 03:10 wcraig1998

Interference of sound waves
two identical speakers are found at points (-x0, 0), (+x0, 0). they have the same phase and emit sinus waves with same amplitude a0 . (sound speed; v = 340 m/s)
a) what's the wavelength ? and wavenumber k of the oscillations when the speakers' frequency f is 1.1 khz?
b) how to both signals overlap along the connecting line between the speakers? consider both signals to be plane waves and write the result as a product of a location and a time dependent component. at which point is no signal heard?
note: cos(a) + cos(b) = 2 cos ((a+b)/2)*cos((a-b)/2)
c) now you place a microphone at (xm, 0). the excitation frequency of the speakers the excitation frequency of the speakers
is tuned from 20 hz to 20 khz. what are the 3 lowest frequencies that produce destructive interference at the location of the microphone? use x0 = 15m, xm = 5m .

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Answer from: Quest

insects!

explanation:

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Answer from: Quest

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

Answer from: Quest

An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to move.

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Interference of sound waves
two identical speakers are found at points (-x0, 0), (+x0, 0). the...