The light reflected from a soap bubble (n = 1.40) appears red (? = 640 nm) at its center. What is the minimum thickness (in nm)?
A. 124
B. 104
C. 114
D. 134
E. 234
Answer: C
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Suppose a "psychic" tells you that "At midnight tonight, everything will double in size." This statement is
A) a scientific prediction that is probably false because the experimental evidence will probably disprove it [based on past experience]. B) a nonscientific statement because no experiment can check it to determine whether it is true or false. C) the greatest idea since sliced bread. D) a nonscientific statement because it is based completely on guess-work. E) a scientific prediction that is certainly false.
Gravitational Force: As a 70-kg person stands at the seashore gazing at the tides (which are caused by the Moon), how large is the gravitational force on that person due to the Moon? The mass of the Moon is 7.35 × 1022 kg, the distance to the Moon is 3.82 × 108 m, and G = 6.67 × 10-11 N ? m2/kg2.
A. 0.24 N B. 0.024 N C. 0.0024 N D. 0.00024 N
A proton moving with a speed of 3.20 × 10^5 m/s perpendicular to a uniform magnetic field of 0.0786 T will follow which of the paths described below? (qp = 1.60 × 10^?19 C and mp = 1.67 × 10^?27 kg)
a. a straight-line path b. a circular path of 4.25 cm radius c. a circular path of 10.9 cm radius d. a circular path of 1.52 cm radius e. a circular path of 54.1 cm radius
What unit is used to measure wavelengths?
a. arc second b. photons c. degrees d. nanometer e. pixels