What is the minimum thickness of a glycerin film (n = 1.47) on which light of wavelength 684 nm shines that results in constructive interference of the reflected light? Assume the film is surrounded front and back by air
a. 233 nm
b. 116 nm
c. 251 nm
d. 503 nm
e. 126 nm
b
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A. Crater |
B. Stone meteorites |
C. Tektites |
D. Meteors |
E. Regmaglypts |
F. Meteor showers |
A mass is bouncing on the end of a spring with a period T when measured by a ground observer. What would the period of oscillation be (as measured by the same observer) if the mass and spring were moving past the ground observer at a speed of 0.600c?
a. 0.440 T c. 0.600 T b. 1.25 T d. 1.67 T
A tungsten wire is 1.50 m long and has a diameter of 1.00 mm. At 20°C a current of 50 mA flows through this wire
The temperature coefficient of resistivity for this tungsten is 4.5 × 10-3/C°, and its resistivity at 20°C is 5.6 × 10-8 ? ? m. (a) What is the potential difference across the ends of this wire at 20°C? (b) If the wire temperature increases by 100 C°, what potential difference across its ends is now required to produce a current of 50 mA?
Which of the following best describes the primary difference between asteroids and comets?
A) Asteroids are rocky and comets are ice-rich. B) Comets are much larger than asteroids. C) Comets always have tails and asteroids never have them. D) Comets tend to orbit the Sun in the inner solar system, while asteroids tend to orbit much farther away.