A Hydrogen atom is excited to the n = 9 level. Its decay to the n = 6 level is detected in a photographic plate. What is the frequency of the light photographed?
A) 5.08 × 1013 Hz
B) 5,910 Hz
C) 5,910 nm
D) 3.28 × 10-9 km
A
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A rock falls from a vertical cliff that is 4.0 m tall. At what speed will the gravitational potential energy of the rock-Earth system (relative to the base of the cliff) be equal to its kinetic energy? Assume that air has no effect on the motion of
the rock. A) 3.1 m/s B) 4.4 m/s C) 6.3 m/s D) 8.9 m/s E) 13 m/s
Water is flowing through a pipe whose cross sectional area at point A is larger than the cross sectional area at point B. The reading on a pressure gauge connected to the pipe at point A will be __________ the reading on a pressure gauge connected to the pipe at point B
Fill in the blank(s) with correct word
A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?
a. ?14 J b. ?12 J c. ?10 J d. ?16 J e. ?25 J
Using the following generic atom description, choose the correct method for determining the number of neutrons
ImageX A) subtract G from F B) subtract F from G C) add F and G D) divide F by G E) look it up on the periodic table