Why is it better to search for extrasolar planets directly using infrared (IR) rather than visible radiation?
A) the planet doesn't reflect any visible radiation, only IR radiation
B) the star doesn't emit any IR radiation because it is too hot
C) the visible light from planets will be blocked by interstellar dust along our line of sight while the IR radiation will not
D) the planet emits more IR radiation than it reflects in the visible
D
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Consider the planet Mars: [Earth mass = 6.0 × 1024 kg = 9.3 × Mars mass; Earth radius = 6380.km = 1.89 × Mars radius] What is the acceleration of gravity on Mars?
What will be an ideal response?
What is the wavelength of a monochromatic light beam, where the photon energy is 2.15 eV? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 nm = 10?9 m, and 1 eV = 1.6 × 10^?19 J)
a. 308 nm b. 578 nm c. 223 nm d. 156 nm e. 475 nm
The formula mass for C2H6 is ______________
Fill in the blank(s) with correct word
Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground. If air resistance is negligible, which statement best applies?
a. The greater mass hits the ground first. b. Both objects hit the ground at the same time. c. The smaller mass hits the ground first. d. No conclusion can be made with the information given.