If a source of light is approaching us at 3,000 km/sec, then all its waves are:
A) blue shifted by 1%.
B) redshifted by 1%.
C) not affected, as c is constant regardless of the direction of motion.
D) blue shifted out of the visible spectrum into the ultraviolet.
E) redshifted out of the visible into the infrared.
A
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Calculate the range of the force that might be produced by the virtual exchange of a proton. Assume ?E??t = h/2?. (mp = 1.67 × 10^?27 kg, c = 3.00 × 10^8 m/s, and h/2? = 1.05 × 10^?34 J?s)
a. 6.72 × 10^?25 m b. 2.10 × 10^?16 m c. 6.00 × 10^?8 m d. 1.54 × 10^?15 m
Suppose that an object is moving with constant acceleration. Which of the following is an accurate statement concerning its motion?
A) In equal times its speed changes by equal amounts. B) In equal times its velocity changes by equal amounts. C) In equal times it moves equal distances. D) The object is not moving; it is at rest. E) A statement cannot be made without additional information.
Solenoid: An ideal solenoid of length 10 cm consists of a wire wrapped tightly around a wooden core. The magnetic field strength is 4.0 T inside the solenoid. If the solenoid is stretched to 25 cm by applying a force to it, what does the magnetic field become?
A. 1.6 T B. 10.0 T C. 20 T D. 4.0 T
Traveling at their current speeds, how long would it take the Pioneer and Voyager probes to travel the distance to the nearest stars?
A) at least 100,000 years B) several billion years C) around 4.4 years D) about a 1,000 years