If y = 0.02 sin (30x ? 400t) (SI units), the wave number is
a. 30 rad/m.
b. 30/2? rad/m.
c. 400/2? rad/m.
d. 400 rad/m.
e. 60? rad/m.
a
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Which of the following would violate the law of charge conservation?
a. A neutron, which has zero charge, becoming an electron and a proton. b. A plastic rod becoming charged by gaining electrons from the fur rubbed against it. c. A glass rod becoming positively charged by being rubbed with silk. d. An electroscope losing its charge by being grounded. e. An electron becoming a positron which has the same mass as an electron and a positive charge of the same magnitude.
In the sun, rising currents of hot gas below the photosphere cause granulation
Indicate whether the statement is true or false
The current in amperes drawn by the heater is
a. 0.1 c. 144,000 b. 10 d. none of the above
If elements A and B chemically bond to each other more strongly than a random mixture of A and B elements chemically bond, it is expected that a _____________ of A and B should form.
Fill in the blank(s) with the appropriate word(s).