The magnifying power of a telescope equals:
A) the diameter of the primary lens or mirror of the telescope.
B) the focal length of the primary mirror or lens divided by the focal length of the eyepiece.
C) the diameter of the eyepiece of the telescope.
D) the focal length of the eyepiece divided by the focal length of the objective of the telescope.
B
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Thin Films: A sodium light, having wavelength 589.3 nm, is used to view a soap film to make it look black when directed perpendicular to the film. What is the minimum thickness of the soap film if the index of refraction of soap solution is 1.38?
A. 114 nm B. 194 nm C. 294 nm D. 314 nm E. 214 nm
The ozone layer seems to be thinning because
What will be an ideal response?
Which one of the following is not an electromagnetic wave?
A) UV B) infrared C) radio waves D) sound waves E) gamma rays
A proton is projected with a velocity of 7.0 × 103 m/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the force that acts on the proton?
A) 0 N B) 3.4 × 10-16 N C) 4.2 × 10-16 N D) 13 × 10-16 N E) 6.7 × 10-16 N