What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 7 state to the n = 2 state? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 199 nm
B) 365 nm
C) 4480 nm
D) 398 nm
E) 796 nm
D
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During each cycle of operation, a refrigerator absorbs 230 J of energy from the freezer and expels 356 J of energy to the room. How much work input is required in each cycle?
A) 712 J B) 586 J C) 460 J D) 126 J
A double convex lens has a focal length of 0.10 m. An object 0.05 m high is placed 0.15 m from the lens surface on the principal axis. Sketch a ray diagram and give the characteristics of the image
Energy conservation tells us that the energy of a system can change via
A. Heat transfer B. The energy of a system cannot change C. Work done and/or heat transfer D. Work done on or by the system
Describe the differences between the Ptolemaic, Tychonian, and Copernican models of the universe
What will be an ideal response?