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2 years ago

Fastest correct answer gets brainliest:

Physics

1 answer:

uysha [10]2 years ago

5 0

Explanation:

Sound and light are similar in that both are forms of energy that travel in waves. They both have properties of wavelength, freqency and amplitude. Here are some differences: Sound can only travel through a medium (substance) while light can travel through empty space

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A lens of focal length 15.0 cm

xeze [42]

Answer:

Explanation:

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2 years ago

The maximum electric field strength in air is 3.0 Mv/m . Stronger electric fields ionize the air and create a spark. What is the

adoni [48]

Answer:

The value is $P_{max} = 2.11 * 10^{6} \ W$

Explanation:

From the question we are told that

The maximized electric field strength is $E = 3.0 \ MV/m = 3.0 *10^{6} \ V/m$

The diameter is $d = 1.5\ cm = 0.015 \ m$

Generally the cross -sectional area is mathematically represented as

=> $A = \frac{\pi * d^2 }{4}$

=> $A = \frac{3.142 * 0.015^2 }{4}$

=> $A = 0.0001767 \ m^2$

Generally the maximum power is mathematically represented as

$P_{max} = \frac{E_{max}^2}{ 2 * \mu_o * c } * A$

Here c is the speed of light with value $c = 3.0 *10^{8} \ m/s$

$\mu_o$ is the permeability of free space with value $\mu_o = 4 \pi *10^{-7} \ H/m$

$P_{max} = \frac{ (3.0 *10^{6})^2}{ 2 * (4 \pi *10^{-7}) * 3.0 *10^{8} } * 0.0001767$

=> $P_{max} = 2.11 * 10^{6} \ W$

4 0

2 years ago

What are materials that doesn't not use electromagnetism

Vladimir [108]

An aluminum bar, for example, is not a good choice for your magnet's core.

8 0

2 years ago

Which of the follwoing best summarizes the wave mechanical model of atoms?

vagabundo [1.1K]

<span>Electrons display some properties of waves and while they reside outside of the nucleus, their positions cannot be known with certainty. </span>

4 0

2 years ago

A classroom that normally contains 40 people is to be airconditioned with window air-conditioning units of 5-kW cooling capacity

oksano4ka [1.4K]

Answer:

About 2 units.

Explanation:

We assume that there is no heat dissipating instrument in the room

Total cooling load of the room is defined from the given below equation

$Q_{cooling}$ = $Q_{light}$ + $Q_{people}$ + $Q_{heat gain}$