Electromagnetic Waves Are Radiated Uniformly in All Directions from a Source

question 46

Multiple Choice

Electromagnetic waves are radiated uniformly in all directions from a source. The rms electric field of the waves is measured 35 km from the source to have an rms value of 0.012 N/C. Determine the average total power radiated by the source.

• A)5.9 × 10³ W
• B)9.0 × 10³ W
• C)2.4 × 10⁴ W
• D)6.3 × 10⁴ W
• E)1.6 × 10⁵ W

---

Definitions:

Drum Brakes

A type of braking system using brake shoes pressed outward against a rotating drum to slow or stop a vehicle.

Disc Brakes

A type of brake that slows or stops a vehicle by squeezing brake pads against a disc or rotor attached to the wheel.

Brake Fade

A reduction in the braking power of a vehicle, often due to overheating of the brake components during heavy use.

Water Fade

A decrease in the performance of brake components due to the presence of water.