A double-slit interference experiment is performed in the air. Later, the same apparatus is immersed in benzene (which has an index of refraction of 1.50), and the experiment is repeated
When the apparatus is in benzene, you observe that the interference fringes are
A) more widely spaced than when the apparatus is in air.
B) equally spaced as when the apparatus is in air.
C) more closely spaced than when the apparatus is in air.
C
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Electric Field of Point-Charges: A small glass bead has been charged to 1.9 nC. What is the strength of the electric field 2.0 cm from the center of the bead? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A. 4.3 × 104 N/C B. 8.5 × 102 N/C C. 8.1 × 10-5 N/C D. 8.5 × 10-7 N/C
A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position?
A. 7.0 N B. 2.0 N C. 3.1 N D. 5.1 N E. 6.6 N
A magnet on a frictionless mount would have its magnetic north pole point toward the Earth’s geographic
A. south pole B. north pole
A neutron has a mass of 1.67 × 10^-27 kg. The de Broglie wavelength is 1.4 × 10^-10 m. How fast is the neutron going? (in m/s)
a. 3.4 × 10^3 b. 2.8 × 10^3 c. 3.9 × 10^3 d. 2.6 × 10^3 e. 1.7 × 10^3