In which of the following energy level transitions for a hydrogen atom is a photon emitted?
a. n =1 to n = 2
b. n =3 to n = 2
c. n =2 to n = 1
d. n =1 to n = 4
e. n =4 to n = 3
B, C, E
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A hoop, solid sphere, and solid cylinder each have the same mass and same radius. When rolling down the same incline, which has the greatest torque from gravity on it?
a. the hoop b. the sphere c. the cylinder d. They all have the same torque.
What do most astronomers now think explains why active galaxies are so energetic?
A. intense magnetic fields B. a supernova explosion C. an immense black hole D. None of these choices is correct.
If eclipses occur in repeatable patterns, then explain why an eclipse is not visible from the same place on Earth after one Saros cycle
What will be an ideal response?
How much better resolution would a 60 mm objective lens have than your eye's 6 mm exit pupil?
A) 6 times B) 10 times C) 16 times D) 60 times E) 100 times