The speed of a 10-kHz sound wave in seawater is approximately 1500 m/s. What is its wavelength in sea water?
A. 5.0 cm
B. 10 cm
C. 15 cm
D. 20 cm
E. 29 cm
Answer: C
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Why does the Sun look flattened near the horizon?
A. The Sun is cooler on the horizon, so it looks flattened. B. The larger refraction near the horizon lifts the lower edge of the Sun more than the upper edge and makes the Sun look flattened. C. The Sun's light is reflected off the horizon, making the Sun appear compressed. D. Earth's dense atmosphere compresses the gaseous Sun.
Determine the resonant frequency of the circuit.
A. 159 Hz B. 32 Hz C. 5 Hz D. 500 Hz E. 79.5 Hz
A region of ionized gas and dust, with imbedded hot young stars, is a(n)
A) emission nebula. B) dust cloud. C) dark nebula. D) nebular hole. E) absorption nebula.
Increasing the separation of the two charged parallel plates of a capacitor, which are disconnected from a battery, will produce what effect on the capacitor?
a. increase charge b. decrease charge c. increase capacitance d. decrease capacitance