According to the shell model, which electrons play the most significant role in determining the properties of an atom?
A) those in the innermost shell
B) those in the shells between the innermost and outermost shells
C) those in the outermost shell
D) Electrons in every shell are just about equally important.
Answer: C
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A star of spectral type G lives approximately how long on the main sequence?
A) 10 billion years B) 1 billion years C) 10 million years D) 1,000 years E) 10,000 years
The electric potential at two points in space is: V1 = 200 volts and V2 = 300 volts. Which of the following statements is true for moving a point charge q from point 1 to 2?
A. The work done by an external agent to move q from point 1 to 2 is positive. B. We can't determine the work done because we don't know the direction of V at the two points. C. The work done by the electric force exerted on q in moving it from point 1 to 2 is W = –q(100 V).
1.A 2.B 3.C 4.A and B 5.A and C 6.B and C 7.A, B, and C 8.None of the aboveWhen a 14.0-A current flows through an 8.00-? device for 24.0 hours, how much does this cost if energy costs $0.0900 per kW ? h?
A) $0.24 B) $3.39 C) $2.16 D) $1.04
Two flat glass plates are in contact along one end and are separated by a sheet of tissue paper at the other end. A monochromatic source of wavelength 490 nm illuminates the top plate. If 20 dark bands are counted across the top plate, what is the paper thickness? (1 nm = 10-9 m) Note that a dark band occurs where the plates contact
a. 2.7 × 10^-6 m c. 4.7 × 10^-6 m b. 3.4 × 10^-6 m d. 4.9 × 10^-6 m