Energy Levels:Given that the energy levels of the hydrogen atom are given by En = 
, where R = 1.097 × 107 m-1, what wavelength photon is emitted when the atom undergoes a transition from the n = 4 to the n = 6 level?
Fill in the blank(s) with the appropriate word(s).
2.625 × 10-6 m
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You are trying to cross a river that flows toward the south with a strong current. You start out in your motorboat on the east bank desiring to reach the west bank directly west from your starting point. You should head your motorboat
A) directly toward the west. B) directly toward the north. C) in a general southwesterly direction. D) in a general northwesterly direction.
Two converging lenses, the first with focal length 25 cm and the second with focal length 20 cm, are separated by 30 cm. A 4.0 cm tall object is placed 50 cm in front of the first lens. What is the height of the final image?
A. 4.0 cm B. 2.0 cm C. 8.0 cm D. 9.3 cm E. 1.0 cm
Suppose we discover a new comet on an orbit that brings it closer to the Sun than Mercury every 125 years. What can we conclude?
A) It has been on its current orbit for only a short time compared to the age of our solar system. B) It came from the Oort cloud. C) It came from the Kuiper belt. D) It has a coma and tail during most of each orbit.
Why does a cloud speed up once it starts to collapse?
A: A black hole sucks it in B: As particles clump together, their gravitational attraction grows C: The heat makes the cloud particles swirl around D: All of the above E: None of the above