An ultraviolet light wave has a wavelength of 300 nm and speed of 1.96 × 10^8 m/s through a transparent medium. What is the frequency of this wave in the medium? (1 nm = 10?9 m and c = 3.00 × 10^8 m/s)
a. 1.00E+15 Hz
b. 3.27E+14 Hz
c. 6.53E+14 Hz
d. 6.53E+5 Hz
e. 1.28E+7 Hz
c
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What property of a Cepheid variable can you determine if you know its period?
a. surface temperature b. absolute magnitude c. apparent magnitude d. mass e. radius
Which of the following provides direct evidence that the chemical building blocks of life (such as amino acids and DNA bases) could have formed naturally under the conditions that were present on the early Earth?
A) Fossil remains of life date to fairly early in Earth's history. B) These chemicals have been formed in laboratory experiments that recreate conditions of the early Earth. C) DNA studies show that all known life on Earth evolved from a common ancestor. D) We have found evidence of complex carbon molecules on Saturn's moon Titan.
A 7.0-kg rock is subject to a variable force given by the equation
F(x) = 6.0 N - (2.0 N/m)x + (6.0 N/m2)x2 If the rock initially is at rest at the origin, find its speed when it has moved 9.0 m. What will be an ideal response?
Protoplanets of the Jovian planets could have grown very hot from
a. heat from the Sun. b. radioactivity of light elements such as hydrogen and helium. c. the infall of material at high velocity. d. tidal forces due to the Sun. e. collisions with large planetesimals.