A 340-Hz sound wave travels at 340 m/s in air with a wavelength of
A) 1 m.
B) 10 m.
C) 100 m.
D) 1000 m.
E) none of the above
Answer: A
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In modern Miller—Urey experiments it is assumed that carbon and nitrogen in the early atmosphere were present as
A) methane (CH4 ) and ammonia (NH3) B) carbon dioxide (CO2 ) and nitrogen (N2) C) carbonates (CO3-) and nitrates (NO3-) D) carbon and nitrogen atoms
A monochromatic light source emits a wavelength of 403 nm in air. When passing through a liquid, the wavelength reduces to 363 nm. What is the liquid's index of refraction?
a. 1.23 b. 1.05 c. 1.11 d. 1.90 e. 1.81
2 600 rev/min is equivalent to which of the following?
a. 2 600 rad/s b. 43.3 rad/s c. 272 rad/s d. 60.0 rad/s
The most common kinds of stars are low-luminosity stars
a. True b. False Indicate whether the statement is true or false