A hair is placed at one edge between two flat glass plates. When this arrangement is illuminated with yellow light of wavelength (l = 600 nm), a total of 61 dark bands are counted starting at the point of contact between the plates. How thick is the hair? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact
a. 3.6 × 10^-4 m
c. 1.8 × 10^-5 m
b. 1.8 × 10^-4 m
d. 3.6 × 10^-5 m
C
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A metal rod of length L in a region of space where a constant magnetic field points into the page rotates about an axis through its center at constant angular velocity ?. The ends, A and E, make contact with a split ring that connects to an external circuit. The current in the external circuit of resistance R has magnitude
A.
B.
.C.
.D.
.E.
.________ radiation is trapped close to our surface by the greenhouse effect
A) Gamma ray B) Ultraviolet C) X-ray D) Infrared E) Radio
Changing the accelerating voltage of an x-ray machine without changing the target material must change:
a. the work function of the material. b. the wavelength of all the x-rays produced. c. the wavelength of the minimum wavelength x-ray that will be produced. d. Both b and c are correct.
The following are data for an accelerating car: t (s) 0 5 10 15 20 ------------------------ v (m/s) 0 3 6 9 12
a. Is this car undergoing uniform acceleration? b. If so, what is the acceleration?