Answer:
A. They do not require a medium to carry information.
D. They carry information very quickly.
Explanation:
The two characteristics that makes electromagnetic waves effective in communication is that they do not require a medium to carry information and they move information very quickly.
- Electromagnetic waves are produced by the vibration between electrical and magnetic fields.
- These waves are notable for being able to propagate without requiring any medium for their movement.
- They also have very fast speed.
- The speed of all electromagnetic waves is equal to that of light.
A 40-gallon gas water heater can recover in about an hour. But a Recovery for a 40-gallon electric water heater takes about two hours.But I'm not so sure about a water tank
If the crate is moving along the floor in the same direction with a constant speed, it is in dynamic equilibrium. Equilibrium means there is no net force acting on the crate.
Since there is no net force on the crate, there must be a friction force on the crate equal in magnitude and opposite in direction to the applied horizontal force. Therefore the force of friction acting on the crate is 100N.
D. the wavelengths that the pigmented object after interacting with sunlight
