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3 years ago

What is waving in an electromagnetic wave?

Physics

1 answer:

BARSIC [14]3 years ago

4 0

Answer:

The electric field and the magnetic field

Explanation:

An electromagnetic wave consists of oscillations of an electric field and a magnetic field, oscillating perpendicularly to each other. The oscillation of the two fields also occur on a plane which is perpendicular to the direction of the propagation of the wave itself (due to this feature, this kind of waves are called transverse waves).

One of the main difference between electromagnetic waves and other waves is that electromagnetic waves are the only one that can travel through a vacuum, since they do not need a medium to propagate (such as, for example, sound waves).

The speed of the electromagnetic waves is constant in vacuum and its value is called speed of light, equal to:

$c=3.0\cdot 10^8 m/s$

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Teresa drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took hours. When Teresa drove

Ksenya-84 [330]

Question:

Teresa drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 12 hours. When Teresa drove home, there was no traffic and the trip only took 8 hours. If her average rate was 20 miles per hour faster on the trip home, how far away does Teresa live from the mountains?

Do not do any rounding.

Answer:

480 miles

That is Teresa lives 480 miles from the mountains

Explanation:

Here we have

Distance D = Speed S × Time t

On her way to the mountain we have

D = S × 12

On her way back we have

D = (S +20)×8

Therefore, by comparing the two above equations, we have

S × 12 = (S +20)×8

Therefore, 12·S = 8·S +160 or

4·S = 160

Hence S = 160/4 = 40 miles/hour

Therefore, from D = S × 12, we have

D = 40 × 12 = 480 miles.

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