Which of the following increases when a sound becomes louder?
A) Frequency
B) Wavelength
C) Amplitude
D) Period
E) Velocity
C
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A horizontal metal bar rotates at a constant angular velocity w about a vertical axis through one of its ends while in a constant magnetic field B that is directed down. The emf induced between the two ends of the bar is
A) constant and proportional to the product B ?. B) constant and proportional to the product B ?2. C) constant and proportional to the product B2 ?2. D) variable with a maximum of B ?. E) variable with a maximum of B ?2.
Consider a beam of free particles with a certain speed . If we double this speed, what happens to the beam’s de Broglie wavelength?
A. It increases by a factor of 2. B. It increases by a factor of 21/2. C. It remains the same. D. It decreases by a factor of 21/2. E. It decreases by a factor of 2.
An object with an initial velocity of 3.50 m/s moves east along a straight and level path. The object then undergoes a constant acceleration of 1.80 m/s2 east for a period of 5.00 s. How far does the object move while it is accelerating?
(F) 6.30 m (G) 17.5 m (H) 27.2 m (J) 40.0 m
What is the phase angle of an AC series circuit that is constructed of a 14.5-? resistor along with 16.5-? inductive reactance and 9.41-? capacitive reactance?
a. 26.1° b. 11.9° c. 43.1° d. 35.0° e. 38.7°