The energy of a photon depends on its
A) speed.
B) frequency.
C) amplitude.
D) all of the above
E) none of the above
Answer: B
Physics & Space Science
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To be dimensionally consistent, velocity [L/T], pressure 
and density 
must be related as follows.
A. velocity = pressure/density
B. 
C. 
D. 
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Type Sc are the dustiest and flattest of the galaxies
Indicate whether the statement is true or false
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A 450 g baseball is pitched, reaching the batter with a speed of 37 m/s and is hit such that it returns on the same line at 48 m/s. If the ball was in contact with the bat for 0.22 seconds, what was the average net force experienced by the ball during the time of contact?
A. 170 N B. 98 N C. 77 N D. 18 N
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How is the direction of a magnetic field defined?
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