Classify the following changes as physical or chemical. Wood burns to ashes; water begins to boil; grass grows; a rock is crushed to powder
A) chemical; physical; chemical; chemical
B) chemical; physical; physical; physical
C) physical; physical; chemical; physical
D) chemical; physical; chemical; physical
Answer: D
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The amount of current produced by electromagnetic induction depends on the
A) amount of induced voltage. B) resistance of the circuit to which it is connected. C) both of these D) none of the above
Which of the following does N* represent in the Drake equation, Nc = N* × fp × nHZ × fL × fI × fs?
A) The average number of planets in a solar system B) The fraction of stars that have planets C) The number of stars in our galaxy D) The fraction of suitable planets on which life begins
The wavelength of the emitted photon when a hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 122 nm B) 203 nm C) 243 nm D) 389 nm E) 411 nm
The greenhouse effect occurs because carbon dioxide is opaque to infrared radiation
a. True b. False Indicate whether the statement is true or false