A thin film appears cyan when illuminated with white light. The color being cancelled by destructive interference is
A) red.
B) green.
C) white.
D) blue.
E) none of the above
Answer: A
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Choose the answer that fills in the three blanks in the correct order: Earth rotates once each ________, Earth orbits the Sun once each ________, and the Moon orbits Earth about once each ________.
A) day, year, month B) day, year, week C) year, day, month D) hour, day, year E) hour, day, month
Pair production can occur if:
A) the energy of two photons is greater than the combined mass-energy of a particle-anti-particle pair. B) only virtual particles are produced. C) photons are at the event horizon of a black hole. D) one particle is struck by a sufficiently high energy photon that a pair of electrons is formed. E) the particle and antiparticle have opposite spins.
Spiral galaxies have more gas, dust, and younger stars than elliptical galaxies do
Indicate whether the statement is true or false
In order for a satellite to be geosynchronous, its orbit must:
a. go over the North and South Poles. b. be over the equator. c. be over a single longitude. d. emit television signals.