A 40.0 cm long organ pipe is filled with air and is open at both ends. The velocity of sound in air at 0
is 331 m/s. If the temperature of the air decreases by 10
then what is the frequency of the fundamental mode?
A. 394 Hz
B. 406 Hz
C. 462 Hz
D. 506 Hz
E. 544 Hz
B. 406 Hz
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As the polar icecaps melt, the resulting water spreads over the entire Earth. This new mass distribution tends to make the length of a day
A) longer. B) shorter. C) none of these
Nuclear Fission and Fusion: The main fuel for producing energy in the center of the sun is
A. helium. B. hydrogen. C. uranium. D. any radioactive material. E. oxygen.
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
Refracting Telescope: A telescope has an angular magnification of 250 when used with a 20 mm eyepiece. What is the focal length of the objective lens?
A. 5.0 cm B. 25 m C. 5000 cm D. 5.0 m E. 2.5 m