A camera lens has a focal length of 50.0 mm and an aperture setting of 4.00. What is the aperture diameter of this lens?
A) 12.5 mm
B) 10.1 mm
C) 13.6 mm
D) 14.2 mm
E) 15.0 mm
A
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According to Einstein’s theory of special relativity, a stationary observer measures
A. a shorter length of an object than a moving observer measures B. a longer length of an object than a moving observer measures C. the same length of an object than a moving observer measures
What is the radius of the smallest electron orbit in a singly-ionized helium atom?
A) 1.06 × 10-10 m B) 1.32 × 10-11 m C) 5.29 × 10-11 m D) 2.65 × 10-11 m
When a 10-N object is suspended at rest by two equally-taut vertical strands of rope, the tension in each strand is
A) less than 5 N. B) 5 N. C) more than 5 N. D) 10 N.
For a sample of a given radioactive isotope, the ratio of the number of atoms of the isotope that exist at a time t to the number that exist at time t+t1/2 is
A. always 2. B. dependent on how long t is after t=0. C. Dependent upon what the value of t1/2 is D. always 1?2. E. might be any number less than 1/2