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Lynna [10]
3 years ago
14

Why do electromagnetic waves not require a medium for travel?

Physics
1 answer:
FinnZ [79.3K]3 years ago
8 0

Answer:

Because they propagate due to presence of magnetic and electric field.

Explanation:

An Electromagnetic wave is a transversal wave conformed of an electric field perpendicular to a magnetic field.              

Maxwell established that an electric field can generate a magnetic field and vice versa, which allows the propagation of the electromagnetic wave without a medium.                

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Which observer would hear the louder sound?<br> a. The woman<br> C. They both do<br> b. The man
egoroff_w [7]

Answer:

B

Explanation:

the answer is b because the man has a deeper voice than the womans high pitched voice

8 0
4 years ago
A 20000 kg subway train initially traveling at 18.5 m/s slows to a stop in a station and then stays there long enough for its br
hodyreva [135]

Answer:

rise the air temperature is 0.179241 K

Explanation:

Given data

mass = 20000 kg

velocity  = 18.5 m/s

long = 65 m

wide = 20 m

height = 12 m

density of the air = 1.20 kg/ m³

specific heat = 1020 J/(kg*K)

to find out

how much does the air temperature in the station rise

solution

we know here Energy lost by the train that is calculated by  

loss in the kinetic energy that is = 1/2 m v²

loss in the kinetic energy = 0.5 × 20000 ×18.5²

loss in the kinetic energy  is 3422500 J

and

this energy is used here to rise the air temperature that is KE / ( specific hat × mass )

so here  

air volume = 65 ×20×12

air volume = 15600 m³

air mass  =  ρ × V = 1.2 × 15600

air mass = 18720 kg

so

rise the air temperature = 3422500 / ( 1020 × 18720)

rise the air temperature is 0.179241 K

7 0
4 years ago
Circle the letter that corresponds to the best answer. 24. In order for trade between two countries to take place, _____. (LO3)
Triss [41]

Answer:

B) Comparative advantage is necessary

8 0
2 years ago
Watt-hours is a measure of energy, just like kilowatt-hours. How can you convert this to Joules?
satela [25.4K]

Work with your units:

1 watt-hour = 1 (joule/second) · (hour) = 1 (joule-hour / second)

(1 joule-hour/sec) · (3600 sec/hour) = 3600 joules

So 1 watt-hour = 3,600 joules

3 0
3 years ago
A skydiver falls toward the ground at a constant velocity. Which statement best applies Newton’s laws of motion to explain the s
Tema [17]

Answer:

The answer is (a.) An upward force balances the downward force gravity on the skydiver

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7 0
3 years ago
Read 2 more answers
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