Study this graph, focusing on the red curve and reddish horizontal swath. Which statement correctly interprets what the graph shows?
A) The measured abundance of deuterium agrees with the theoretically predicted abundance only if we make the prediction with a model of the universe in which ordinary matter makes up about 5% of the critical density.
B) The abundance of deuterium in the universe has rapidly decreased with time.
C) The actual abundance of deuterium in the universe has never changed, but the predicted abundance has decreased with time.
D) The abundance of deuterium in the universe is high in galaxies near the Milky Way but much lower in galaxies that are much farther away.
A) The measured abundance of deuterium agrees with the theoretically predicted abundance only if we make the prediction with a model of the universe in which ordinary matter makes up about 5% of the critical density.
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A resistor is connected to an AC power supply. On this circuit, the current
A) leads the voltage by 90°. B) lags the voltage by 90°. C) is in phase with the voltage. D) leads the voltage by 45°. E) lags the voltage by 45°.
Which produces the narrowest diffraction pattern?
a. white light b. violet light c. yellow light d. red light e. green light
A wave is represented by the equation y(x, t) = 3.2 cm sin(1000 rad/s t - 50
x). Another wave is represented by the equation y(x, t) = 4.2 cm sin(1000 rad/s t - 50
x). If the two waves interfere destructively, then what is equation that represents the coherent superposition of the two waves?
A. y(x, t) = 7.4 cm sin(1000 rad/s t + 50.0
x)
B. y(x, t) = 1.0 cm sin(1000 rad/s t - 50.0
x)
C. y(x, t) = 1.0 cm sin(1000 rad/s t + 50.0x)
D. y(x, t) = 7.4 cm sin(1000 rad/s t - 50.0x)
A bare roof of a warmly heated home on a snowy day indicates
A) an unwanted flow of heat. B) good insulation. C) a change of phase. D) all of the above