posted by kennedy .
1) Yellow light that has a wavelength of 560 nm passes through two narrow slits that are 0.300 mm apart. An interference pattern is produced on a screen 160 cm distant. What is the location of the first-order maximum?
2) A communication satellite is orbiting 36 000 km above Earth’s surface. Two cities, 3500 km apart are transmitting to and receiving signals from each other. Find the time required to transmit a signal from one city to the other. They are equidistant from the satellite.
x(min1) =λL/2•d =560•10^-9•1.6/2•0.3•10^-3 =1.49•10^-3m =1.49 mm
I don't understand why you're multiplying by two for the second question.
nevermind I get it