The ionization energy for the hydrogen atom is 13.6 eV. What is the energy of a photon that is emitted as a hydrogen atom makes a transition between the n = 4 and n = 3 states?
a. 3.40 eV
c. 6.80 eV
b. 0.66 eV
d. 2.55 eV
B
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An electroscope is charged positively as indicated by foil leaves that stand apart. As a negative charge is brought close to the electroscope, the leaves become
A) closer together. B) farther apart. C) motionless.
Exhibit 7-1
Three 5.0-kg masses are located at points in the xy plane as shown in the figure.
?
?
Use this exhibit to answer the following question(s).
Refer to Exhibit 7-1. What is the magnitude of the resultant force (caused by the other two masses) on the mass at x = 0.40 m, y = 0?
A. 2.2 × 10?8 N B. 1.9 × 10?8 N C. 1.4 × 10?8 N D. 1.6 × 10?8 N E. 2.5 × 10?8 N
A uniform meter stick with a mass of 135 g rotates about an axis perpendicular to the stick passing through the center of the stick with an angular speed of 3.50 rad/s2. What is the magnitude of the angular momentum of the stick?
A) 0.0394 kg?m2/s B) 0.473 kg?m2/s C) 0.0739 kg?m2/s D) 0.158 kg?m2/s E) 0.0236 kg?m2/s