What current flows in a 60. mH inductor when 12. V AC at a frequency of 20. kHz is applied to it?
What will be an ideal response?
1.6 mA
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The spacing of the atoms of a crystal is 159 pm. A monoenergetic beam of neutrons directed normally at the surface of the crystal undergoes first order diffraction at an angle of 58° from the normal
What is the energy of each of the neutrons? (mneutron = 1.675 × 10-27 kg, 1 eV = 1.6 × 10-19 J, h = 6.626 × 10-34 J ? s) A) 0.045 eV B) 0.039 eV C) 0.050 eV D) 0.056 eV E) 0.061 eV
In former times, most beverage containers were refillable
What will be an ideal response?
The two photons produced in an electron-positron annihilation have equal but oppositely-directed momenta to match the zero momentum of the electron-positron pair. Which of the following conservation laws are obeyed in the pictured interaction?
a. Conservation of energy. b. Conservation of momentum. c. Conservation of charge. d. Both a. and b. but not c. e. All of a., b. and c.
Infall of ________ may explain the higher than expected star formation rates in galaxies
Fill in the blank(s) with correct word