Answer:
Electromagnetic field, a property of space caused by the motion of an electric charge. A stationary charge will produce only an electric field in the surrounding space. If the charge is moving, a magnetic field is also produced. An electric field can be produced also by a changing magnetic field.
Answer:
1)
2)
Explanation:
1)
The intensity equation is given by:
Where:
- P is the power of the radio wave
- r is the distance from the source
2)
Now, the intensity and the electric field are related as:
Here:
- c is the speed of light
- ε₀ is the electric permittivity
- E is the electric field
We need to solve it for E.
I hope it helps you!
Answer:
Explanation:
For this case we know that the speed of the sound is given by:
And we have the following info provided:
represent the car leading
represent the car behind with the source
is the frequency for the observer
And we can find the frequency of the source with the following formula:
And replacing we got:
So then the frequency for the source would be the same since the both objects are travelling at the same speed.
Are there any options or is it not a multiple choice question.
Answer:
Consider frames X and Y:
If X sees Y moving to his right then Y must see X moving to his right.
If this is not true then one can choose one frame over the other ( a favored frame and this is not allowed)