To double the resolving power of a telescope, you must ________.
A. decrease the diameter by half
B. increase the collecting area by a factor of two
C. increase the diameter by a factor of two
D. decrease the collecting area by half
Answer: C
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Determine Qnet for the toasting bread in problem 7.9, if the surroundings act as a gray surface with emissivity of 0.45 and temperature of 85ºC.
____________________ is the resistance of a gas to the flow of radiation
Fill in the blank(s) with correct word
A proton is accelerated from rest through a potential difference of 150 V. It then enters a region of uniform magnetic field and moves in a circular path (radius = 12 cm). What is the magnitude of the magnetic field in this region?
a. 18 mT b. 12 mT c. 15 mT d. 22 mT e. 10 mT
A single slit forms a diffraction pattern, with the first minimum at an angle of 40.0° from central maximum, when monochromatic light of 630-nm wavelength is used
The same slit, illuminated by a new monochromatic light source, produces a diffraction pattern with the second minimum at a 60.0° angle from the central maximum. What is the wavelength of this new light? A) 425 nm B) 475 nm C) 450 nm D) 500 nm E) 525 nm