Briefly explain extrasolar planets
What will be an ideal response?
A planet orbiting another star is called an extrasolar planet. Such a planet would be quite faint and difficult to detect so close to the glare of its star. But there are ways to find these planets. To see how, all you have to do is imagine walking a dog.You will remember that Earth and its moon orbit around their common center of mass, and two stars in a binary system orbit around their center of mass. When a planet orbits a star, the star moves very slightly as it orbits the center of mass of the planet-star system. Think of someone walking a poorly trained dog on a leash; the dog runs around pulling on the leash, and even if it were an invisible dog, you could plot its path by watching how its owner was jerked back and forth. Astronomers can detect a planet orbiting another star by watching how the star moves as the planet tugs on it.
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The moons of Jupiter are
A) all made of rock. B) all made of ice. C) made of a mixture of rock and ice. D) all captured asteroids. E) made mostly of hydrogen and helium gas.
The light gathering ability of a telescope is most dependent on the diameter of its primary objective
Indicate whether the statement is true or false
The distance between the ruled lines on a diffraction grating is 1,770 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band
What is the longest wavelength that appears in the third order spectrum? A) 590 nm B) 570 nm C) 550 nm D) 530 nm E) 610 nm
Fire a cannonball with enormous speed from a hypothetical cannon and it curves due to gravity. Shine a light from a flashlight parallel to the cannon and it
A) follows a straight-line path. B) curves downward as much as the cannonball. C) curves slightly upward.