a. If you quadruple propagation distance, how much will signal intensity change at the receiver?

7a.) At 10 meters, a signal has a strength of 100 mW. About how strong will it be at 40 meters?

a. About 0.5 mW 

b. About 5 mW 

c. About 25 mW 

d. About 6 mW 

b. If you increase propagation distance by a factor of 100, how much will signal intensity change at the receiver?

7b.) At 10 meters, a signal has a strength of 100 mW. About how strong will it be at 100 meters?

a. About 10 mW 

b. About 1 mW 

c. About 0.1

d. None of the above

c. If the signal strength from an omnidirectional radio source is 8 mW  at 30 meters, how strong will it be at 150 meters, ignoring absorptive attenuation? Show your work.

d. What will it be at 200 meters?

e. If the signal strength from an omnidirectional radio source is 20 mW at 10 meters, how strong will it be at 70 meters, ignoring absorptive attenuation? Show your work.

7e.) If the signal strength from an omnidirectional radio source is 100 mW at 10 meters, how strong will it be at 30 meters, ignoring absorptive attenuation?

a. About 30 mW

b. About 11 mW

c. About 4 mW

d. About 0.1 mW