Question No. 10: When transmitter power is doubled the signal to noise ratio gets doubled, thus making signal?

Answer 1

higher s/n is better. so the reception at a given location will be more reliable. it will have better margin for fade resistance, and be clearer with less errors under normal conditions.

Answer 2

...detectable at 1.414 times the previous limit of detection.

My crystal ball is malfunctioning again, so I'm having difficulty determining the context of the question.