If continuous spectrum light from a star passes through a cool, low-density gas on its way to your telescope and spectroscope, ____ spectrum on the continuous spectrum results
a. a dark (absorption) line
b. a bright (emission) line
c. continuous
a
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Two harmonic waves traveling in opposite directions interfere to produce a standing wave described by y = 2sin(4x)cos(3t), where x is in m and t is in s. What is the speed (in m/s) of the interfering waves?
a. 0.75 b. 0.25 c. 1.3 d. 12 e. 3.0
A 1.4-cm tall flower is 4.0 cm from a spherical concave mirror. If the image of the flower is 4.0 cm tall, how far is the image from the mirror?
A) 11 cm B) 9.4 cm C) 1.4 cm D) 0.090 cm
A 2.0 ?F capacitor is charged to 12. V and then discharged through 4 × 106 ?. How long will it take for the voltage across the capacitor to drop to 3.0 V?
What will be an ideal response?
The closest planet to Earth is
a. Mars. b. Venus. c. Mercury. d. Saturn.