A longitudinal wave travels on a slinky or any long spring. The wave is represented by the equation x(x, t) = 2.1 cm cos(2000 rad/s t - 40
x). What is the direction of the velocity of the wave?
A. the - x direction
B. the + x direction
C. the - y direction
D. the + y direction
B. the + x direction
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Time Dilation: A certain unstable particle has a mean lifetime of 1.52 × 10-6 s. This is the time interval between its creation in a nuclear process and its extinction into decay products, as measured in a frame of reference at rest with respect to the particle. An average such particle is observed by a scientist on Earth to travel 342 m in its lifetime. What is the speed of the particle relative to Earth? (c = 3.00 × 108 m/s)
A. 0.821c B. 0.681c C. 0.600c D. 0.551c E. 0.335c
Answer the following statement(s) true (T) or false (F)
Bell’s theorem shows that quantum theory contradicts any “hidden variable theory” that presumes that a quanton has objectively real properties
A semiconductor can be
A) a conductor. B) an insulator. C) both of these D) neither of these
The ionosphere
a. reflects all EM waves b. reflects high frequency radio waves c. reflects low frequency radio waves d. is responsible for the greenhouse effect e. absorbs ultraviolet light in sunlight