The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 × 10^?6/°C. On a cold day when the temperature is –10°C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40°C is __________
Fill in the blank(s) with correct word
300.15 m
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Describe two ways in which an atom can be excited
What will be an ideal response?
Objects that radiate relatively well
A) absorb radiation relatively well. B) reflect radiation relatively well. C) both of these D) neither of these
Light of wavelength 575 nm falls on a double-slit and the third order bright fringe is seen at an angle of 6.5°. What is the separation between the double slits?
A) 5.0 ?m B) 10 ?m C) 15 ?m D) 20 ?m E) 25 ?m
Mort stands on Earth. Velma moves away from him in a rocket, at 299,000 km/s (1000 km/s slower than lightspeed). Mort sends a laser beam toward Velma. As the tip of the beam passes her rocket, Velma observes that
A) the laser beam moves past her at just 1000 km/s. B) the laser beam moves past her at 300,000 km/s. C) Both of the above. D) the laser beam never catches up with her. E) Mort has turned into a giant frog.