Physics, 05.05.2020 14:57 NatalieKnows

Two identical forward-facing loudspeakers are 33.6 cm apart. They are both connected to a signal generator that makes them vibrate in phase at a frequency of 2.12 kHz (Take the speed of sound as 340 m/s. Consider nonnegative angles only. Enter your answers from smallest to largest, starting with the smallest answer in the first answer blank below. Enter NONE in any remaining unused answer blanks.) (a) At what angles (in degrees), measured from the perpendicular bisector of the line joining the speakers, would a distant observer hear maximum sound intensity? smallest value (b) At what angles (in degrees) would such an observer hear minimum sound intensity? smallest value

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Answer from: SmokeyRN

Explanation:

Given that:

distance of the two identical loudspeakers are = 33.6 cm = 0.336 m

The frequency = 2.12 kHz = 2.12 × 10³ Hz

speed of sound V = 340 m/s

Then using the formula;

$\lambda = \frac{V}{f} \\ \\ \lambda = \frac{340}{2.12*10^3} \\ \\ \lambda = 0.160 \ m$

For maximum sound intensity;

$dsin \theta = m \lambda$

$\theta = sin^{-1} ( \frac{m \lambda }{d})$

For m = 0

$\theta_1 = sin^{-1} (\frac{0*0.160}{0.336}) \\ \\ \theta_1 = 0^0$

For m = 1

$\theta_2 = sin^{-1} (\frac{1*0.160}{0.336}) \\ \\ \theta_2 = 28.44^0$

For m = 2

$\theta_3 = sin^{-1} (\frac{2*0.160}{0.336}) \\ \\ \theta_3 = 72.25^0$

For m = 3

No more values for angle are found

∴ $\theta_4 = \ None$

For minimum intensity

$dsin \theta = (m+ \frac{1}{2}) \lambda \\ \\ \\ \theta = sin^{-1} (\frac{(m+\frac{1}{2})\lambda}{d})$

For m = 0

$\theta_1 = sin^{-1} (\frac{(0+\frac{1}{2})*0.160}{0.336}) \\ \\ \theta_1 = 13.77^0$

For m= 1

$\theta_2 = sin^{-1} (\frac{(1+\frac{1}{2})*0.160}{0.336}) \\ \\ \theta_2 = 49.59^0$

For m = 2;

There is no value for the angle

∴ $\theta_3 = 0$

Answer from: Quest

quantum mechanics or quantum physics is physics of very small objects (particles) and physical entities.

quantum physics has some parallels to our macro world and some pretty unique ideas which theoretically and mathematically proven to be true even though we will never be able to access them because of our size.

there are many types of particles: subatomic, elementary etc.

subatomic means they are smaller than atom, elementary means they are at the very basis of everything.

subatomic particles are for eg. protons, neutrons but not electrons.

elementary particles are categorised into 3 groups by what they do.

these 3 groups are quarks, leptons and bosons.

light for example is a particle more precisely a photon a part of leptons.

proton (subatomic particle) is made out of 2 up quarks and 1 down quark each of these has a fractional charge like $\frac{1}{3}$ . (i crazy)

most famous scientist who contributed to this physics are:

max planckalbert einsteinerwin schrödingermany

the topic itself us understand a lot and will probably be vastly used in the future (quantum computers, understanding the big bang,

we also must not forget quantum effects like:

superposition (where 1 thing can be this and that at the same time),entanglement (where two particles are seemingly connected by some sort of unknown (or known) force, energy, matter (i know all that can be the same at least it was at the beginning)

and there is more. but probably too much for this answer to be consistent due to my average understanding of this topic.

hope this you understand quantum mechanics a little more. i'm not an expert in the topic (so don't be like wth if you are an expert) but i'm very interested in it.

anyways quantum physics is a very hard topic (harder than physics (perhaps)) therefore searching for every information there is about it and learning it is unfortunately impossible (you can only specialise into 1 - 3 things or more (perhaps

have fun and i wish you luck!

r3t40

Answer from: Quest

i think it's 35 meters

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