What is the evidence that a meteorite impact caused the great extinction at the end of the Mesozoic?
What will be an ideal response?
Answer: The concentration of iridium at the Cretaceous/Tertiary boundary. Most of Earth's iridium is deep within its interior. The concentration of iridium in a meteorite is higher than the iridium concentration in Earth's crust.
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Which statement about pulsars is true?
A) Pulsars can form only in close binary systems. B) All pulsars are neutron stars, but not all neutron stars are pulsars. C) Pulsars can "pulse" no more than about once a day. D) All neutron stars are pulsars.
The paths of the planets' orbits lie in all different directions in the sky.
Answer the following statement true (T) or false (F)
The first mate of a pirate ship shoots the noonday Sun with a sextant and measures the altitude to be 50o to the south on December 21 . The time on the ship's clock is 4 P.M. (GMT). What are the longitude and latitude of the ship?
A pair of narrow slits that are 1.8 mm apart is illuminated by a monochromatic coherent light source. A fringe pattern is observed on a screen 4.8 m from the slits
If there are 5.0 bright fringes/cm on the screen, what is the wavelength of the monochromatic light? A) 550 nm B) 600 nm C) 650 nm D) 700 nm E) 750 nm