This diagram shows a probability map of electron positions in an atom. Blue represents a high probability of finding the electron, while black represents zero probability of finding the electron. Which statement is true as we understand it today?
A) The electron can "jump" from the inner blue region to the outer blue region without crossing the space in between.
B) An electron in the inner blue region can never move to the outer blue region.
C) We say that the black region is "excluded," in accord with the exclusion principle.
D) The electron can move from the inner blue region to the outer blue region only by moving through the black region at high speed.
A) The electron can "jump" from the inner blue region to the outer blue region without crossing the space in between.
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The sound of a jet engine is given as 120 dB. What is the intensity of the jet sound wave?
A. 1.0 W/m2 B. 0.8 W/m2 C. 0.6 W/m2 D. 0.4 W/m2 E. 0.2 W/m2
Inside a house, stepping on a tile floor barefooted may feel almost cold, but stepping on carpet in an adjacent room feels comfortably warm. Why is this?
a. It's because the tile is below room temperature while the carpet is at room temperature. b. It's because the tile is at room temperature while carpet is normally warmer. c. It's because the thermal conductivity of tile is less than that of carpet. d. It's because the thermal conductivity of carpet is less than that of tile.
The _____ of quasars imply that they must be at great distances, some farther away than any known galaxy
A) large redshifts B) small redshifts C) large blueshifts D) small blueshifts
The unstable isotope 234Th decays by ? emission with a half-life of 24.5 days
The initial decay rate of the sample was 9.9 × 1013 Bq. (1 u = 1.6605 x 10-27 kg) (a) What mass of 234Th was initially present? (b) What is the decay rate after 68 days?