Which of the following represents the equipotential lines of a dipole?
a.
b.
c.
e
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?Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30°angle. A light ray that enters parallel to mirror 2 reflects from mirror 1 and then from mirror 2. The angle of reflection of that ray from mirror 2 is
A. ?0°. B. 30°. C. ?60°. D. ?90°. E. ?120°.
Which of the following lies halfway between the celestial poles?
A) The celestial north point B) The celestial zenith C) The celestial equator D) The celestial south point
How can the Doppler method be used to estimate the average orbital distance of a planet's orbit?
A) by measuring the speed at which the star orbits the mutual center-of-mass of the star and planet, and using Newton's theory of gravity B) by measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak, and using Newton's version of Kepler's Third law C) by measuring the asymmetries in the velocity curve D) by measuring the amount by which the starlight is reduced when the planet transits
In 1974 we transmitted a message toward the globular cluster M13 which is 21,000 ly away. What is one reason that this object was probably not ideal for sending a message to?
A) it is so far away that we will probably have stopped communicating before we receive and return signal B) globular clusters contain young, high mass stars with insufficiently long main sequence lifetimes and hence are unsuitable places for life C) the message will be absorbed by interstellar dust before it reaches the cluster D) globular clusters contain, old, low mass stars with fewer heavy elements and hence are not ideal places for life