What happens when a battery is recharged?
a. The negative charge is turned around and made into a positive charge again.
b. The cells are turned around and connected in the opposite direction.
c. An electric charger runs current backward through the battery and reverses the chemical reactions.
d. The electrolyte is poured out and replaced.
e. Electric charge is pumped back into the battery to be released again when the charge is used.
c
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The frequency of a periodic wave is 340 Hz. The period of the vibration motion of the wave is
A. 2.56 milliseconds. B. 2.94 milliseconds. C. 3.55 milliseconds. D. 3.94 milliseconds. E. 4.25 milliseconds.
Roughly how many stars are within 4 parsecs of the solar system?
A) 3 B) 30 C) 3000 D) 300,000 E) 200 billion
Describe how Eratosthenes measured the circumference of our planet
What will be an ideal response?
A beam of light of wavelength 600 nm is incident normally on a grating with a spacing between slits of 1.70 × 10-4 cm. At what angle away from the centerline does a first-order maximum occur?
A) 10.5° B) 12.1° C) 16.4° D) 18.2° E) 20.7°