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GuDViN [60]
3 years ago
12

Which invention was created to help people with hearing problems? the multiplex telegraph the telephone the phonograph the motio

n-picture machine.
Physics
1 answer:
Nataliya [291]3 years ago
7 0

The phonograph was invented for people with hearing problems. Option D is correct.

<h3>What is a Phonograph?</h3>
  • It is a device that records sounds or music in the grooves of a plate and plays them.
  • This was the first invention that can record and play music.
  • It was invented by Thomas Alva Edison.
  • This device helps people with hearing problems by allowing them to practice concentrating on a different sound.

Therefore, the phonograph was invented for people with hearing problems.

Learn more about Phonograph:

brainly.com/question/858851

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Answer:

I(x)  = 1444×k ×{\pi}

I(y)  = 1444×k ×{\pi}

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Explanation:

Given data

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to find out

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solution

first we consider the polar coordinate (a,θ)

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x = a cosθ

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so

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take limit 0 to 6 for a and o to \pi /2 for θ

I(x) = \int_{0}^{6}\int_{0}^{\pi/2} y²p dA

I(x) = \int_{0}^{6}\int_{0}^{\pi/2} (a sinθ)²(k × a²) adθda

I(x) = k  \int_{0}^{6}a^(5)  da ×  \int_{0}^{\pi/2}  (sin²θ)dθ

I(x) = k  \int_{0}^{6}a^(5)  da ×  \int_{0}^{\pi/2}  (1-cos2θ)/2 dθ

I(x)  = k ({r}^{6}/6)^(5)_0 ×  {θ/2 - sin2θ/4}^{\pi /2}_0

I(x)  = k × ({6}^{6}/6) × (  {\pi /4} - sin\pi /4)

I(x)  = k ×  ({6}^{5}) ×   {\pi /4}

I(x)  = 1444×k ×{\pi}    .....................1

and we can say I(x) = I(y)   by the symmetry rule

and here I(o) will be  I(x) + I(y) i.e

I(o) = 2 × 1444×k ×{\pi}

I(o) = 3888×k ×{\pi}   ......................2

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The frequency of the wave in our problem is
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