A beam of light emerges from water into air at an angle bent
A) towards the normal
B) away from the normal.
C) in a direction parallel to the normal.
D) in a direction perpendicular to the normal.
E) not at all.
Answer: B
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Resistance and Resistivity: A 120-m long metal wire having a resistivity of 1.68 × 10-8 ? ? m has a resistance of 6.0 ?. What is the diameter of the wire?
A. 0.065 mm B. 0.65 mm C. 0.65 cm D. 0.65 m
Which of the following is a weak base?
a. NH3 b. NaOH c. KOH d. Ca(OH)2
Photon Energy: Gamma rays are photons with very high energy. How many visible-light photons with a wavelength of 500 nm would you need to equal the energy of a gamma-ray photon with energy 4.1 × 10-13 J?
A. 1.0 × 106 B. 1.4 × 108 C. 6.2 × 109 D. 3.9 × 103
The unique feature of Neptune is:
A) that its rotational axis is tilted 98 degrees. B) that it rotates in a retrograde sense. C) that its atmosphere rotates more slowly than its interior. D) that it has no ring system. E) its banded cloud surface.