An observer stands 3 m from speaker A and 4 m from speaker B. Both speakers, oscillating in phase, produce 170-Hz waves. The speed of sound in air is 340 m/s. What is the phase difference (in radians) between the waves from A and B at the observer's location, point P?
?
?
a.
0
b.
?/2
c.
?
d.
2?
e.
4?
c
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In science fiction movies, spaceships are often shown dodging through large numbers of closely spaced, boulder-size objects. Which of the following real things in our solar system would look most like such science fiction dangers?
A) the rings of Saturn B) the asteroid belt C) the atmosphere of Jupiter D) the Oort cloud
Suppose the surface temperature of the Sun were about 18,000 K, rather than 6,000 K. How much more thermal radiation would the Sun emit? How would the thermal radiation spectrum of the Sun be different?
What will be an ideal response?
The magnetic field in a region of space is parallel to the surface of a long flat table. Imagine that this page is lying flat on the table. When current is present in the coil, which is lying on the table, the coil tends to rotate so that the left side moves up and the right side moves down. The magnetic field is
A. directed parallel to the page and downwards. B. directed parallel to the page and upwards. C. directed parallel to the page and to the right. D. directed parallel to the page and to the left. E. in a direction that cannot be determined in this experiment
Which of the following is true about the seasons on Uranus?
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