The ionization energy of the hydrogen atom is 13.6 eV. What is the energy of a photon emitted corresponding to a transition from the n = 5 to n = 3 state?
a. 0.97 eV
b. 1.81 eV
c. 3.40 eV
d. 6.80 eV
e. 0.24 eV
a
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Two lenses, the first with focal length 10.0 cm and the second with focal length -12.5 cm, are separated by 20.0 cm. An object, 2.40 cm tall, is 15.0 cm in front of the first lens. What is the size of the final image?
A. 2.40 cm B. 4.80 cm C. 12.4 cm D. 24.0 cm E. 0.96 cm
During the period of one day, the number of high tides at a given location is about __________
Fill in the blank(s) with correct word
A certain membrane has a diffusion constant 
and a thickness of
The area of the membrane is 5.00 
If the difference in the concentration across the membrane is 2.44 
then the rate of particles diffusing through the membrane is
A. 
B. 
C. 
D. 
E. 
In a supersaturated solution,
a. the solvent has become the solute. b. the normal solubility is exceeded. c. more solute than solvent is present. d. the dissolved and undissolved solute are in equilibrium.