(a) What is the wavelength of the peak of the blackbody radiation curve for something at 3,000 kelvins (the temperature of the filament of a light bulb)? (b) What type of EM wave is this?
(a) 9.67 × 10^-7 m, (b) infrared
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Suppose that the star Betelgeuse (the upper left shoulder of Orion) were to supernova tomorrow (as seen here on Earth). What would it look like to the naked eye?
A) Betelgeuse would remain a dot of light but would suddenly become so bright that for a few weeks we'd be able to see this dot in the daytime. B) We'd see a cloud of gas expanding away from the position where Betelgeuse used to be. Over a period of a few weeks, this cloud would fill our entire sky. C) Because the supernova destroys the star, Betelgeuse would suddenly disappear from view. D) Betelgeuse would suddenly appear to grow larger in size, soon reaching the size of the full Moon. It would also be about as bright as the full Moon.
A changing magnetic field produces an electric field
a. True b. False Indicate whether the statement is true or false
The internal resistances of an ideal voltmeter and an ideal ammeter are, respectively (ideal meaning the behavior of the system is not changed when using the meter):
a. zero and infinite. c. zero and zero. b. infinite and zero. d. infinite and infinite.
If a sensor was placed in the flow of Problem 4, it would rotate about the z-axis at what angular velocity at (1, ?1)?
(A) 5 rad/s (B) 4 rad/s (C) 3 rad/s (D) 2 rad/s