"If the scientist had an infinity of time at his
disposal, it would be
sufficient to say to him,
"Look, and look carefully"."
Henri Poincare
What does this mean?

I think it mean...hmm since a scientist is learning about the world and giving knowledge to the public he has to make observations and do test trials to see if something is 100% correct. I think this quote may relate to that. if he has infinite time, he can observe and test for a long time, and he would look, and look carefully at everything he may be studying or whatever he is surrounded by in this world. hope this helps! Have a nice day :) (p.s if you want please give me brainliest)

if you already have the answer to (a), then just work out how many periods there are in 1 minute, and that's the answer to (c).