Answer:
Explanation:
Given:
- frequency of the broadcast,
- we have the speed of the radiation equal to the speed of light,
The broadcast waves are the electromagnetic waves but it can travel only upto a hundred kilometers without any loss of information carried by it.
<u>The relation between the frequency and the wavelength:</u>
Answer:
All are true except the last point that says that a battery is a current source and the current at the outlet is always the same.
Explanation:
- A battery is an electro-chemical device which converts the chemical energy into usable electrical energy thus it provides electrical energy.
- Since, the battery maintains a a constant potential difference between its terminals, once connected.
- Since, the movement of electric current requires energy, which is supplied by the electric potential energy stored in the battery.
- The current in the battery flows as per the Ohm's law and we can not say that the current leaving will always remain constant.
- As the current is the flow of electric charge, and charges are not stored in batteries unlike capacitors, thus the current at the leaving end will depend on Ohm's law and will vary accordingly.
Static electricity is the build up of electrical charges on the surface of some object or material.
Static electricity is usually created when materials are pulled apart or rubbed together causing positive (+) charges to collect one material and negative (-) charges on the other surface.
It is called static because the charges remain in one area for a while rather than moving or flowing to another area.
Results from static electricity may be sparks, shock or materials clinging together.
