A beam of monochromatic light with a wavelength of 650 nm passes through a diffraction grating with slits 2500 nm apart. How many spots are observed on a large screen placed a small distance in front of the diffraction grating? A. 1 B. 3 C. 5 D. 6 E. 7

An engine undergoes a cycle as shown in the diagram. during a complete cycle the work done by the gas is 28.5×103 j and the energy transferred thermally out is 99.4×103 j. there are 1.5×1024 gas molecules and they have three active degrees of freedom. 6. (6 pts) during which process(es) is energy transferred thermally into the gas? a. 1→2 b. 2→3 c. 4→1 d. 1→2 and 4→1 e. none of the above