A thin sheet of plastic (n = 1.60) is inserted between two panes of glass to reduce infrared (? = 700 nm) losses. What thickness (in nm) is necessary to produce constructive interference in the reflected infrared radiation?
a. 218
b. 109
c. 55
d. 318
e. 443
b
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A distant galaxy is emitting light from the helium spectrum at 388.9 nm. On Earth the wavelength of the light from this galaxy is measured to be 540.6 nm
Estimate how far from Earth (in light-years) this galaxy is if the Hubble constant has the value 22 km/s per million light-years. (c = 3.00 × 108 m/s, 1 ly = 9.461 × 1015 m, 1 y = 3.156 × 107 s)
Gravitational waves
A. carry material into black holes. B. do not carry energy. C. are traveling distortions of space and time. D. are how pulsars pulse.
A ball of mass 5.0 kg is suspended by two wires from a horizontal arm that is attached to a vertical shaft, as shown in the figure
The shaft is in uniform rotation about its axis. The rate of rotation is adjusted until the tensions in the two wires are EQUAL. At that speed, the radial acceleration of the ball is closest to A) 4.9 m/s2. B) 5.9 m/s2. C) 6.9 m/s2. D) 7.9 m/s2. E) 9.9 m/s2.
What might have made the original solar nebula begin to contract?
A) the Big Bang B) the formation of our arm of the Milky Way C) the shock wave from a nearby exploding star D) interstellar magnetism generated by pulsars E) the large amount of angular momentum in the nebula