Aglass plate (n = 1.64) is covered with a thin, uniform layer of oil (n = 1.27). a light beam of variable wavelength from air is incident normally on the oil surface. observation of the reflected beam shows constructive interference at 501 nm. determine the minimum non-zero thickness of the oil film.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.