X-rays with an energy of 400 keV undergo Compton scattering from a target. The scattered rays are deflected at an angle of 38° relative to the direction of the incident rays.What is the kinetic energy of the recoiling electrons?
a. 56.9 J
b. 51.5 J
c. 34.3 J
d. 13.7 J
a
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Hydrogen Balmer lines are essentially absent in the O and M type stars.
Answer the following statement true (T) or false (F)
Which of the following extrasolar planets would be easiest to detect using the Doppler shift method?
A) a massive planet far from its parent star B) a low mass planet far from its parent star C) a low mass planet close to its parent star D) a massive planet close to its parent star
The name of the average distance from Earth to the sun is one ____________________
Fill in the blank(s) with correct word
The free-body diagram below represents a 1500-kg car sitting on a 3000-kg bridge supported at its far ends. The car's position is three quarters of the length L from the left end of the bridge. Identify the one error in the torque equation below:
?
?
?
A.
never produces a torque on the bridge no matter where the axis of rotation is placed.B.
never produces a torque on the bridge no matter where the axis of rotation is placed.C.
cannot produce a torque on the bridge no matter where the axis of rotation is taken since it is at the center of the bridge.D.
from the left end of the bridge is 0, F1L should be 0.E.
from the right end of the bridge is 0, F2L should be 0.