Describe the impact the discovery of extrasolar planets h as had on the question of life on other worlds
What will be an ideal response?
We do not yet know how common small, rocky Earth-like planets are around other stars, or what are the characteristics of their orbits. This is the primary motivation for new space-based missions. We can speculate, however, on the possibility of life on moons around the Jupiter-like planets in close-in orbits around other stars, much as we speculate on life on, e.g. Europa or Titan. These discoveries have led to the study of life in extreme environments on Earth.
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Diffraction Gratings: A diffraction grating with 396 lines/mm is illuminated with light of wavelength 343 nm. What is the angular separation between the two second-order bright fringes?
A. 31.5° B. 15.8° C. 32.9°
A 55kg girl swings on a swing, whose seat is attached to the pivot by 2.5m long rigid rods (considered to be massless in this problem). As she swings, she rises to a maximum height such that the angle of the rods with respect to the vertical is 32 degrees. What is the average torque on the rods due to her weight, as she moves during one cycle of her swinging from the bottom of her swing path to the highest point?
A. 370 Nm B. 970 Nm C. 2400 Nm D. 2000 Nm
Ron fills a beaker with glycerin (n = 1.473) to a depth of 4.0 cm. If he looks straight down through the glycerin surface, he will perceive the liquid to be what apparent depth?
a. 5.9 cm b. 4.0 cm c. 2.7 cm d. 3.3 cm e. 4.9 cm
The Orion Nebula, M-42, is a hot, thin cloud of glowing gas, so its spectrum is
A) a continuum, strongest in the color red. B) a few bright lines against a dark background. C) a few dark lines in the continuum. D) a continuum, but with both bright and dark lines mixed in. E) not in the visible portion of the spectrum.