An electromagnetic wave is made up of which of the following oscillating quantities?
a. electrons only
b. electric fields only
c. magnetic fields only
d. electric and magnetic fields
d
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Red dwarf stars ____
a. never develop a hydrogen-fusion shell b. create large amounts of carbon and oxygen c. have much shorter lifetimes than Sun-like stars d. never begin hydrogen fusion e. become brown dwarfs after they exhaust their hydrogen core
In perceiving its environment, a dolphin makes use of
A) echoes. B) the Doppler effect. C) ultrasound. D) all of the above E) none of the above
A particle is in the first excited state of a one-dimensional box of length 1.0 m. What is the minimum value of its momentum (in kg ? m/s)?
a. 3.3 × 10^?34 b. 6.6 × 10^?34 c. 9.9 × 10^?34 d. 13 × 10^?34 e. 22 × 10^?34
Molecular hydrogen, H2, is thought to be the most abundant molecule in interstellar space, but it is difficult to detect. Which easily detected molecule occurs in space along with hydrogen, the measurement of which allows us to estimate the amounts of molecular hydrogen?
a. CO, carbon monoxide
b. H2O, water vapor
c. CO2, carbon dioxide
d. CH3, methyl radical