According to our present theory of solar system formation, how did Earth end up with enough water to make oceans?
A) The water was mixed in the other materials in the planetesimals that accreted at our distance from the Sun.
B) The water was formed by chemical reactions among the minerals in the Earth's core.
C) The water was brought to the forming Earth by planetesimals that accreted beyond the orbit of Mars.
D) Earth formed in the relatively narrow region of the solar nebular in which liquid water was plentiful.
C
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In a diffraction experiment, light of 600. nm wavelength produces a first-order maximum 0.350 mm from the central maximum on a distant screen
A second monochromatic source produces a third-order maximum 0.870 mm from the central maximum when it passes through the same diffraction grating. What is the wavelength of the light from the second source?
An electron is moving with the speed of 1780 m/s. What is its de Broglie wavelength? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A) 409 nm B) 302 nm C) 205 nm D) 420 nm E) 502 nm
A Teflon rod 6 inches in diameter and 2 feet long is at 230ºF. It is then exposed at one end to cool air so that that end is at 80ºF whereas the cylindrical surface cools to 150ºF. The other end remains at 230ºF. Determine the expected temperature distribution.
What will be an ideal response?
Which of the following is not an observed pattern of motion in our solar system?
A) Most planets orbit the Sun at the same speed. B) All planets orbit the Sun in the same direction. C) Most planetary orbits lie nearly in the same plane. D) Most planets rotate in the same direction in which they orbit. E) Almost all moons orbit their planet in the same direction as the planet's rotation.