Two pure tones are sounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is increased?
A) It does not change.
B) It decreases.
C) It could either increase or decrease.
D) It increases.
C
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Circular Motion of Charges: An electron moving perpendicular to a uniform magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A. 2.2 × 107 m/s B. 1.9 × 107 m/s C. 1.9 × 106 m/s D. 3.0 × 107 m/s E. 0.80 × 107 m/s
Two pipe columns are required to have the same Euler buckling load Pcr. Column 1 has flexural rigidity EI1 and height L; column 2 has flexural rigidity (2/3) EI2 and height L. The ratio (I2/I1) at which both columns will buckle under the same load is approximately:
(A) 0.8
(B) 1.0
(C) 2.2
(D) 3.1
Two coherent sources emit waves of 2.0-m wavelength in phase. If the path length to an observer differs by ________, then _________ interference occurs.
A. 1.0 m, constructive B. 2.0 m, destructive C. 3.5 m, constructive D. 7.0 m, destructive E. 8.0 m, destructive
Red giant stars are I. more luminous than the sun. II. larger in diameter than the sun. III. cooler than B stars. IV. located above the main sequence stars in the H-R diagram
a. I & II b. II & IV c. I, II, & IV d. II, III, & IV e. I, II, III, & IV