When sound waves superimpose they can interfere
A) constructively.
B) destructively.
C) either of these
D) neither of these
Answer: C
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Interference effects are less visible for thick films because the reflected waves
A) from the bottom surface are too dim. B) become too dispersed. C) are out of phase with one another. D) are too displaced to interfere.
The pressure inside a commercial airliner is maintained at 1 atm (1.01 × 10^5 N/m2). What is the outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure (at 10-km height) is 0.3 atm?
a. 1.4 × 10^2 N b. 1.4 × 10^3 N c. 1.4 × 10^4 N d. 1.4 × 10^5 N e. 7.0 × 10^3 N
Elliptical galaxies contain more gas, dust and young stars than do Sa galaxies
Indicate whether the statement is true or false
A proton's rest mass is 1.67 × 10^?27 kg. Calculate its kinetic energy when it is accelerated to a speed of 0.80 c
a. 1.0 × 10^?10 J b. 1.5 × 10^?10 J c. ?2.0 × 10^?10 J d. 2.5 × 10^?10 J e. 7.5 × 10^?10 J