An electric field surrounds all
A. electric charge
B. protons
C. electrons
D. of the given answers
Answer: D. of the given answers
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An unusual lightning strike has a vertical portion with a current of ?400 A downwards. The Earth's magnetic field at that location is parallel to the ground and has a magnitude of 30 ?T. In N, the force exerted by the Earth's magnetic field on the 25 m-long current is
A. 0. B. 0.012 N, East. C. 0.012 N, West. D. 0.30 N, West. E. 300 N, East.
Suppose that at a certain time a quanton has a well-defined wavelength of 0.15 nm. At that time, we perform an experiment to locate the quanton and get the result x = 0.45 nm to a high degree of precision. What can we say about the wavelength of the quanton’s wave function after the experiment?
A. It is still 0.15 nm. B. It is now 0.30 nm. C. It is now 0.45 nm. D. It is now not well-defined. E. Other (specify).
As a rotating gas cloud contracts, it spins
A) at a constant rate. B) faster due to an increase in angular momentum. C) slower due to conservation of angular momentum. D) slower due to a decrease in angular momentum. E) faster due to conservation of angular momentum.
Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it really is. Assume a cylindrical bottle with an inner radius of 1.0 cm and an outer radius of 2.0 cm. What percentage of the apparent volume is the real volume?
a. 95% b. 60% c. 80% d. 64% e. 75%