Determine the maximum altitude of the Sun on December 22 for an observer located at 30°N
36.5°
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A clarinet behaves like a tube closed at one end. If its length is 1.0 m, and the velocity of sound is 344 m/s, what is its fundamental frequency (in Hz)?
a. 264 b. 140 c. 86 d. 440 e. 172
Yellow dwarfs have ________ spectral lines than red giants.
A. wider B. narrower C. weaker D. stronger
A light emitting diode emits light of approximate wavelength 670 nm. What is the band gap?
A) 1.86 eV B) 4.14 eV C) 1.80 eV D) 3.72 eV E) 2.70 eV
The diameter of no. 12 copper wire is 0.081 in. The maximum safe current it can carry (in order to prevent fire danger in building construction) is 20 A
At this current, what is the drift velocity of the electrons? (The number of electron carriers in one cubic centimeter of copper is 8.5 × 1022.) A) 0.044 mm/s B) 0.44 mm/s C) 0.44 cm/s D) 0.44 m/s E) 4.4 m/s