A proton moving at 3 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is directed downwards, how long does it take the proton to return to the horizontal plane? (HINT: Ignore gravity.) [mProton = 1.67 × 10^?27 kg, qProton = +1.6 × 10^?19 C.]
7.8 × 10^?7 s
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You observe a distant galaxy. You find that a spectral line of hydrogen that is shifted from its normal location in the visible part of the spectrum into the infrared part of the spectrum. What can you conclude?
A) The galaxy is moving away from you. B) The galaxy is moving toward you. C) The galaxy has weak gravity. D) The galaxy is made purely of hydrogen.
To double the light-gathering power of a telescope, we need to double the diameter.
Answer the following statement true (T) or false (F)
Consider the Bohr Theory Hydrogen atom in the 2 nd excited state
(a) Determine the binding energy (eV) of the electron. (b) What is the radius of the electron orbit? (c) How far is it from the next higher excited orbit?
At what distance from a point charge of 8.0 ?C would the electrical potential be 4.8 × 10^4 V? (ke = 8.99 × 10^9 N?m2/C2)
a. 1.8 m b. 0.43 m c. 1.5 m d. 5.4 m e. 0.60 m