A camera used for aerial mapping has a lens with a 30-cm diameter maximum aperture and a 42-cm focal length. Light of 550 nm wavelength is used to form the image
Assuming that the resolution of the camera is limited only by diffraction, what is the smallest angle (in milliradians) subtended by an object on the ground that can be resolved by this camera at maximum aperture? A) 1.6 mrad
B) 2.2 mrad
C) 3.2 mrad
D) 4.5 mrad
E) 6.3 mrad
B
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A ringing alarm clock is placed in a bell jar, which is then sealed, and the air is pumped out of it. Which effect will most likely occur?
1.The sound of the ringing alarm clock will get louder as the air is pumped out. 2.The sound of the ringing alarm clock will get softer as the air is pumped out. 3.No noticeable change will occur as the air is pumped out. 4.The sound will diminish completely immediately after the air has begun to be pumped out.
What is the total translational kinetic energy in a test chamber filled with nitrogen (N2 ) at 2.16 × 105 Pa and 20.7°C?
The dimensions of the chamber are 4.00 m × 5.70 m × 7.40 m. The ATOMIC weight of nitrogen is 28.0 g/mol, Avogadro's number is 6.022 × 1023 molecules/mol and the Boltzmann constant is 1.38 × 10-23 J/K.
The study of rocks is called
a. petrology. b. mineralogy. c. paleontology. d. geology.
A main-sequence star of 8.5 solar masses can become a white dwarf by
a. exceeding the Chandrasekhar limit. b. losing mass in a close binary. c. gaining mass. d. remaining at 8.5 solar masses.