Plane waves of ultrasound, f = 51.0 kHz, impinge on a flat plane with a 1.00-cm-wide slit. What is the total angular width (2?) of diffracted sound waves when the speed of sound in air is 340 m/s
a. 167°
b. 83.6°
c. 19.5°
d. 41.8°
e. 0.11°
b
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As the Sun rotates, an individual sunspot can be tracked across its face. From eastern to western limb, this takes about:
A) 12 hours. B) a week. C) two weeks. D) a month. E) 5.5 years.
According to the principle of equivalence, acceleration is equivalent to
A) velocity. B) net force. C) gravity. D) the state of free-fall. E) energy.
A magnifying lens has a focal length of 10 cm. A person has a near point of 25 cm
(a) What is the magnification of the lens for that person when their eyes are focused at infinity? (b) What is the magnification of the lens for that person when their eyes are focused at their near point?
A particle (m = 20 mg, q = -5.0 mC) moves in a uniform electric field of 60 N/C in the positive x direction. At t = 0, the particle is moving 30 m/s in the positive x direction and is passing through the origin. Determine the maximum distance beyond x = 0 the particle travels in the positive x direction
a. 25 m b. 20 m c. 15 m d. 30 m e. 60 m