White light incident normal to a thin soap film with n = 1.34 reflects with an interference maximum at 684 nm and an interference minimum at 570 nm with no minima between those two values. What is the thickness of the soap film?
A)
766 nm
B)
627 nm
C)
638 nm
D)
894 nm
E)
510 nm
C
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Newton showed that Kepler's laws are
A) natural consequences of the law of universal gravitation. B) seriously in error. C) actually only three of seven distinct laws of planetary motion. D) the key to proving that Earth orbits our Sun.
A cyclotron of radius 0.25 m accelerates protons in a 1.7-T magnetic field. What is the frequency for the applied alternating voltage?
A) 0.26 MHz B) 2.6 MHz C) 26 MHz D) 260 MHz E) 2600 MHz
The mass of Mars, 6.40 × 1023 kg, is about one-tenth that of the Earth, and its radius, 3395 km, is about half that of Earth. What is the mean density of Mars?
What will be an ideal response?
The lithosphere consists of
a. all of the crust's depth. b. all of the crust's depth and part of the mantle's depth. c. part of the crust's depth. d. all of the crust's depth and all of the mantle's depth.