Many Earth-based telescopes are larger than the Hubble Space Telescope, so what justifies the great expense of a "space-based" instrument?
What will be an ideal response?
The atmosphere distorts images and usually limits resolution. A telescope in the vacuum of space can achieve its intrinsic resolution and yield pictures with relatively high detail. It also can use parts of the spectrum which get absorbed by the atmosphere.
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The coefficient of linear expansion of steel is 12 × 10-6 K-1. What is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 K?
A) 1.2 cm B) 1.4 cm C) 1.6 cm D) 1.8 cm E) 2.0 cm
What is the most accurate way to determine the distance to a very distant galaxy?
A) Stellar parallax B) main-sequence fitting C) white dwarf supernova D) Cepheid variables E) Hubble's law
Light has wavelength 600 nm in a vacuum. It passes into glass, which has an index of refraction of 1.5. What is the frequency of the light inside the glass? (c = 3.0 × 108 m/s)
A) 3.3 × 1014 Hz B) 5.0 × 1014 Hz C) 3.3 × 105 Hz D) 5.0 × 105 Hz
There are more neutrons than protons in most nuclei because neutrons are physically smaller than protons
What will be an ideal response?