Energy Levels:Consider the Bohr model for the hydrogen atom. (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s) (a) How much energy (in eV) is needed to cause a transition of an electron from the second excited state to the third excited state?(b) What wavelength photon just has enough energy to initiate the transition in (a)?
What will be an ideal response?
(a) 0.661 eV (b) 1.88 ?m
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Which of the following paraphrases Hubble's Law?
A) The faster the galaxy spins, the more massive and luminous it is. B) The greater the distance to a galaxy, the greater its redshift. C) The greater the distance to a galaxy, the fainter it is. D) The more distant a galaxy is, the younger it appears. E) The older the galaxy appears to us, the more luminous it is.
The unit of electric resistance, the ohm, is equivalent to which of the following?
a. V/A b. V?m c. A/s d. A/m
Three different resistors are connected in parallel. If R1 < R2 < R3, their equivalent resistance when connected is
1.between R1 and R2. 2.less than R1. 3.neither between R1 and R2 nor less than R1. 4.dependent on the order in which they are attached in parallel.
After striking a concave mirror, a paraxial beam of light passes through the mirror's focal point
Indicate whether the statement is true or false