When two identical waves arrive at the same place in phase, there is
a. constructive interference.
b. destructive interference.
c. diffraction.
d. a Doppler effect.
e. a shock wave.
a
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Which of the following unit equations is true?
A. N·C = V/m B. N·m = V·C C. N·V = N·m D. N/m = V/C E. N/V = m/C
Comets are rocky bodies that orbit the Sun beyond the orbit of Neptune
a. True b. False Indicate whether the statement is true or false
Two or more forms of the same element that have different bonding structures in the same physical phase are called
a. isobars. b. allotropes. c. isotopes. d. isomers.
An electric field produces a magnetic field even when there is no wire to conduct a current provided:
a. the electric field is changing as time passes. b. the electric field is different from place to place. c. the electric field changes in time but at each instant is the same at every location. d. the electric field is between a pair of parallel metal plates. e. the electric field does not change as time passes.