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3 years ago

Would the speed of an EM wave be the same in air and in water? Defend your answer.

Physics

2 answers:

Svetlanka [38]3 years ago

7 0

Answer

No speed will be not same in air and water

Explanation:

The speed of the EM wave is $3\times 10^{8}m/sec$ in air the speed of the EM wave depends on the relative permeability and relative permitivity of the medium

The speed of the EM wave is given by $c=\frac{1}{\sqrt{\mu _0\varepsilon _0}}$

As the value of $\mu _0$ and $\epsilon _0$ is different in different media so the speed of EM wave is also different in different media

So the velocity of EM wave will not be same in air and water

monitta3 years ago

3 0

Answer:

Speed of an EM wave is different in air and in water.

Explanation:

The speed of an EM wave is different in air and water .

Since the frequency of any EM wave is its characteristic property, therefore wavelength and speed of EM wave Change on changing the medium of propogation.

Also the refractive index $(\mu)$ of any medium is defined as the ratio between light's speed in vacuum to the light's speed in any medium.

Also ,it can be define as speed of any EM wave in any medium = c/refractive index of medium.

Here, c is the speed of light, $c=3\times 10^{8} m/s$ .

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4 years ago

Two wires carry current I1 = 73 A and I2 = 31 A in the opposite directions parallel to the x-axis at y1 = 3 cm and y2 = 13 cm. W

bogdanovich [222]

Answer:

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Explanation:

The magnetic field B due to a long straight wire carrying a current, i at a distance R from the wire is given by

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Now, let y be the point where the magnetic fields of both wires are equal.

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At the point where the magnetic field is zero, B₁ = B₂. So,

μ₀i₁/2π(y - 3) = μ₀i₂/2π(13 - y)

cancelling out μ₀ and 2π, we have

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cross-multiplying, we have

(13 - y)i₁ = (y - 3)i₂

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dividing through by 104, we have

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3 years ago

The magnetic field inside a 5.0-cm-diameter solenoid is 2.0 T and decreasing at 3.00 T/s . Part A What is the electric field str

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Given Information:

Diameter of solenoid = 5.0 cm

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Required Information:

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Answer:

The electric field strength inside the solenoid at a point on the axis is zero.

Explanation:

From the Faraday's Law

E = -r/2 dB/dt

Where dB/dt is the rate of change of magnetic field and r is zero because the distance from the axis is zero.

Therefore, electric field strength inside the solenoid at a point on the axis is 0.

7 0

3 years ago

Atoms are electrically neutral because there are an equal number of protons in the nucleus and In the cloud around the nucleus

Alborosie

Answer:

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Explanation:

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3 years ago

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Answer:

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