A 140. KeV photon strikes an electron and scatters through an angle of 120.°
(a) What is the wavelength of the photon before scattering?
(b) What is the photon wavelength after scattering?
(a) 8.86 pm
(b) 12.51 pm
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A hollow conducting sphere of radius 12 cm had a charge of
C placed on it. What is the potential at the center of the sphere?
A. 0 V
B. 24 V
C. 
D. 
E. infinite
A 30-year-old woman takes a trip on a rocket, leaving her 20-year-old brother behind. She travels at a speed of 0.8c, and is gone 20 years, according to the younger brother. When she returns, how many years older/younger is she than her brother?
a. 2 years younger b. 2 years older c. 3 years older d. 10 years older e. 8 years older
The star Aldebaran is cooler and much more luminous than the Sun. Where do you expect to find Aldebaran in the H-R diagram?
A. bottom left B. top left C. bottom right D. center E. top right
A skater can spin faster by pulling her arms closer to her body or spin slower by spreading her arms out from her body. This is due to
A) the law of gravity. B) Newton's third law. C) conservation of momentum. D) conservation of angular momentum. E) conservation of energy.