If a star collapses to a tenth its size, gravitation at its surface increases by
A) ten.
B) twenty.
C) one hundred.
D) one thousand.
E) more than one thousand.
Answer: C
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Diffraction intensities occur when _________law of diffraction is obeyed.
Fill in the blank(s) with the appropriate word(s).
Standing Sound Waves: Consider a pipe of length L that is open at one end and closed at the other end. What are the wavelengths of the three lowest-pitch tones produced by this pipe?
A. 4L, 2L, L B. 2L, L, L/2 C. 2L, L, 2 L/3 D. 4L, 4L/3, 4L/5
Why can one not use quasars to check the Hubble relation relating distances of objects to their velocity of recession?
What will be an ideal response?
An electron and a proton are each released from rest in the same uniform electric field. The electron moves a distance delectron and the proton moves a distance dproton as each particle's kinetic energy increases by 1.6 eV. How do delectron and dproton compare?
a. delectron < dproton b. delectron > dproton c. delectron = dproton d. The answer depends on the direction of the electric field.