The softening point for the soda-lime glass in Figure 9.3 is approximately _________K.
Fill in the blank(s) with the appropriate word(s).
910
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The electron density in copper is 8.49 × 10^28 electrons/m3 . The electron charge is e = ?1.60 × 10^?19 C. When a 1.00 A current is present in a copper wire with a 0.40 cm2 cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is
a. ?1.84 × 10^?6. b. +1.84 × 10^?6. c. ?1.84. d. ?5.43 × 10^5. e. +5.43 × 10^5.
Lunar eclipses do not occur every full Moon, because the path of the ________ is tilted relative to the ________.
A. Sun; ecliptic B. Moon; ecliptic C. Earth; ecliptic D. Moon; equator
A system consisting of a negatively-charged particle and an electric field
A. gains potential difference and kinetic energy when the charged particle moves in the direction of the field. B. loses electric potential energy when the charged particle moves in the direction of the field. C. gains kinetic energy when the charged particle moves in the direction of the field. D. gains electric potential energy when the charged particle moves in the direction of the field. E. gains potential difference and electric potential energy when the charged particle moves in the direction of the field.
What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state n = 8 jumps to the final state n = 2?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 486 nm B) 205 nm C) 104 nm D) 610 nm E) 389 nm