One fairly crude method of determining the size of a molecule is to treat the molecule as an infinite square well (a box) with an electron trapped inside, and to measure the wavelengths of emitted photons
If the photon emitted during the n = 2 to n = 1 transition has wavelength 1940 nm, what is the width of the molecule? (c = 3.00 × 108 m/s, h = 6.626 × 10-34J ? s, mel = 9.11 × 10-31 kg)
A) 1.21 nm B) 1.12 nm C) 1.45 nm D) 1.33 nm
D
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A rocket with an initial mass of 1000 kg adjusts its thrust by varying the rate at which mass is ejected. The ejection speed relative to the rocket is 40 km/s. If the acceleration of the rocket is to have a magnitude of 20 m/s2 at an instant when its mass is 80% of the original mass, at what rate is mass being ejected at that instant? Ignore any external forces on the rocket.
A. 0.40 kg/s B. 0.50 kg/s C. 0.60 kg/s D. 0.70 kg/s E. 0.80 kg/s
Which of the half-reactions below would be complementary and balance the following half-reaction?
Zn+2 ? Zn A) Cu ? Cu+2 B) K+ ? K C) 2 Cu ? 2 Cu+2 D) 2 K+ ? 2 K E) Cl2 ? 2 Cl-
A truck is carrying a 120-kg refrigerator, which is 2.20 m tall and 85.0 cm wide has its center of mass at its geometrical center. The refrigerator is facing sideways and a short strip on the bed of the truck keeps the refrigerator from sliding
What is the maximum acceleration that the truck can have before the refrigerator begins to tip over? A) 1.90 m/s2 B) 4.17 m/s2 C) 3.79 m/s2 D) 7.58 m/s2 E) 8.34 m/s2
Consider two different rods. The greatest thermal conductivity will be in the rod with
a. electrons that are freer to move from atom to atom. b. the greater specific heat. c. the greater cross-sectional area. d. the greater length.