A high-frequency sound source produces a high
A) speed.
B) amplitude.
C) pitch.
D) all of the above
E) none of the above
Answer: C
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As a rotating gas cloud contracts, it spins
A) at a constant rate. B) faster due to an increase in angular momentum. C) slower due to conservation of angular momentum. D) slower due to a decrease in angular momentum. E) faster due to conservation of angular momentum.
When you look through a sheer curtain at a distant street lamp, you see a pattern of colored spots of light. This occurs by
a. polarization of light in scattering and partial absorption by the threads. b. interference of light waves that pass through the threads with light waves that pass through the openings between the threads. c. refraction of light waves differentially in the cylindrical threads. d. diffraction of light waves passing through the two dimensional pattern of openings between the threads. e. reflection of light waves by the sides of the threads.
Refracting Telescope: The objective lens of a telescope has a focal length of 2.0 m and its eyepiece has a focal length of 1.0 cm. What is the magnification of this telescope when viewing Jupiter?
A. 0.0050 B. 0.50 C. 2.0 D. 20 E. 200
Regarding the Earth and a cloud layer 800 m above the Earth as the "plates" of a capacitor, calculate the capacitance if the cloud layer has an area of 1.0 km2. If an electric field of 2.0 × 106 N/C makes the air break down and conduct electricity (lightning), what is the maximum charge the cloud can hold?
What will be an ideal response?