If you hear a tree fall, you know:
a. that the momentum of the tree was conserved in the collision.
b. that the tree hitting the ground was an elastic collision.
c. that the tree hitting the ground was an inelastic collision.
d. that kinetic energy increased when the tree hit the ground.
e. that kinetic energy was unchanged when the tree hit the ground.
c
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A Young's double slit has a slit separation of 1.65 × 10^?5 m on which a monochromatic light beam is directed. The resultant bright fringes on a screen 1.10 m from the double slit are separated by 2.25 × 10^?2 m. What is the wavelength of this beam? (1 nm = 10?9 m)
a. 6.90 nm b. 205 nm c. 337 nm d. 338 nm e. 408 nm
Electric charge is measured in units of
a. coulombs. b. watts. c. volts. d. newtons.
The meteorites that strike Earth are:
A) pieces of comets that fall to Earth. B) mostly made of iron. C) the oldest rocks known. D) the remains of the planet between Mars and Jupiter. E) material from outside our solar system.
Monochromatic light is incident on a grating that is 75 mm wide and ruled with 50,000 lines. The second-order maximum is seen at 32.5°. What is the wavelength of the incident light?
A) 202 nm B) 403 nm C) 452 nm D) 605 nm E) 806 nm