The annealing point for the soda-lime glass in Figure 9.3 is approximately _________K
Fill in the blank(s) with the appropriate word(s).
715
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Today, astronomers can detect and measure stellar parallax for thousands of the nearest stars, providing us with direct evidence that Earth really does orbit the Sun. Moreover, as the Parallax Angle animation shows (return to the main "Parallax" screen, and select the "Parallax and Distance" button), these measurements allow us to calculate distances to these relatively nearby stars. If we hope to use parallax to measure distances to even more-distant stars, which of the following telescopes would be most useful?
A. A telescope placed on the same orbit of the Sun as Earth, but on the opposite side of the Sun B. A larger version of the Hubble Space Telescope, placed in Earth orbit C. An extremely large telescope built at the best observing site on Earth D. A telescope that orbits the Sun in the outer solar system
What is the quantum number n of a particle of mass m confined to a one-dimensional box of length L when its momentum is 4h/L?
a. 1 b. 4 c. 2 d. 8 e. 16
How have scientists been able to determine that Earth has a liquid metal outer core?
What will be an ideal response?
At the top of the Hertzprung—Russell diagram we find
A) red giant stars B) white dwarfs C) supergiant stars D) main sequence stars