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Lady bird [3.3K]
3 years ago
10

The energy per unit volume in an electromagnetic wave is: ________

Physics
1 answer:
Marianna [84]3 years ago
6 0

Answer:

c.

Explanation:

Electromagnetic waves are waves that are generated when an electric field and a magnetic field vibrate together. They are usually created whenever an electric field collides with a magnetic field.

In more generic terms for an electric field, the energy per unit volume is given by:

Energy density = \dfrac{1}{2}\varepsilon _oE^2

For magnetic field:

Energy density =\dfrac{\beta^2}{2 \mu _o}

∴

For the electromagnetic wave (u):

Total energy density is:

u = \dfrac{1}{2}\varepsilon_oE^2 + \dfrac{\beta ^2}{2 \mu_o}

Due to the fact that the energy related with both fields is equivalent:

Then:

E = cB

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so A.
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What the 3 law of newton mean
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A 3.0-kg cart is rolling across a frictionless, horizontal track toward a 1.3-kg cart that is held initially at rest. The carts
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Answer:

Explanation:

a ) Momentum of first cart = mass x velocity

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Total momentum = 13.8 - 2.47

= +11.33 kg m /s

b )

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6 0
3 years ago
True or False:A wind is a horizontal movement of air from an area of high pressure to an area of lower pressure.
Taya2010 [7]

Answer:

True

Explanation:

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  • The greater the pressure difference more is the speed of the wind. The instrument used to measure the speed of the wind is called an anemometer.
  • The winds are named after the direction from which they flow.
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A certain ultrasound device can measure a fetal heart rate as low as 50 beats per minute. This corresponds to the surface of the
balu736 [363]

Answer:

The. Machine must detect a shift of

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Explanation:

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={ ( Vsound +V/ V sound -V) -1}f emitted

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= { 1540+4E-4/1540-4E)-1) 2*10^6

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