What advantages does a large-diameter astronomical telescope have over a telescope of a smaller diameter?
What will be an ideal response?
The ability of a telescope to collect light, its light-gathering power, is proportional to the area of the telescope's lens or mirror, which means it is proportional to the primary's diameter squared.
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If an electric field of magnitude 25 V/m makes an angle of 30° with a path of length 10 m, then the integral of E?dl over this path has a value of
A) 30 V. B) 250 V. C) 125 V. D) 217 V. E) -250 V.
A 3.6 
C charge is moved from a position where its electric potential energy is 7.2 my to a position where its potential energy is 1.8 my. What is the potential at the first position?
A. 1500 V B. 2000 V C. -2000 V D. 3500 V E. -1500 V
Uncertainty Principle Using Energy and Time: If the maximum possible accuracy in measuring the energy of a particle increases, the maximum possible accuracy in measuring its lifetime will
A. increase. B. decrease. C. not be affected.
A proton starting from rest travels through a potential of 1.0 kV and then moves into a uniform 0.040-T magnetic field. What is the radius of the proton's resulting orbit? (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C)
A) 0.080 m B) 0.11 m C) 0.14 m D) 0.17 m E) 0.19 m