Infrared light of wavelength 2.5 mm illuminates a 0.20-mmdiameter hole. What is the angle of the first dark fringe in radians? In degrees?

Which one of the following research methods can show cause and effect

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

Which are true about beta reactions? there will be more than one answer. a. it has no change b. it doesn't change the mass of the number c. it has a mass of 0.0005 atoms d. it causes transmutation.