Which of these are good conductors?
A) feathers.
B) wood.
C) snow.
D) all the above
E) none of the above
Answer: E
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Index of Refraction: When light travels from air into water,
A. its velocity, wavelength and frequency all change. B. its velocity changes, but its frequency and wavelength do not change. C. its frequency changes, but its velocity and wavelength do not change. D. its velocity and wavelength change, but its frequency does not change. E. its wavelength changes, but its velocity and frequency do not change.
A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2 . At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
a. 0.55 s b. 0.63 s c. 0.69 s d. 0.59 s e. 0.47 s
An FM radio station broadcasts at 96.7 MHz. What is the wavelength associated with this broadcast?
A) 3.1 m B) 0.32 m C) 2.9 × 1014 m D) 2.9 × 1016 m E) not enough information given
A single slit of width 0.030 mm is used to project a diffraction pattern of 500 nm light on a screen at a distance of 2.00 m from the slit. What is the width of the central maximum?
A. 1.7 cm B. 3.3 cm C. 6.7 cm D. 1.5 mm E. 3.0 mm