A single slit, 1,400 nm wide, forms a diffraction pattern when illuminated by monochromatic light of 490 nm wavelength. The largest angle from the central maximum at which the intensity is zero is closest to:
A) 44°
B) 41°
C) 38°
D) 35°
E) 32°
A
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The reason the planets appear to be near the ecliptic is
a. the planets revolve around the Sun in nearly the same plane b. compared to the stars, the planets are near the Sun. c. because the Sun orbits the Earth once per year. d. the ecliptic is only 23 degrees from the celestial equator. e. the planets are much nearer to us than the Sun.
Suppose the distance to a star was doubled but everything else about the star stayed the same. What would happen to the star's luminosity and apparent brightness?
A) Luminosity is decreased by a factor of four and the apparent brightness is decreased by a factor of four. B) Luminosity is decreased by a factor of two and the apparent brightness is decreased by a factor of two. C) Luminosity remains the same, but the apparent brightness is decreased by a factor of two. D) Luminosity remains the same, but the apparent brightness is decreased by a factor of four. E) Luminosity is decreased by a factor of four, but the apparent brightness remains the same.
There is an uncertainty associated with every measurement
Indicate whether the statement is true or false
Lenz's Law: According to Lenz's law, the induced current in a circuit always flows to oppose the external magnetic field through the circuit.
A. True B. False