What is the longest wavelength in the Paschen series?
A) 2.01 nm B) 1.88 nm C) 365 nm D) 2.01 ?m E) 1.88 ?m
E
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A possible design of a "warp drive" might involve
A) generating a shortcut between two distant parts of the universe through a black hole B) placing a movable massive object like a black hole in front of a spacecraft and using its gravity to shorten the spatial distances in front of the rocket C) using the annihilation of matter and antimatter to accelerate a spacecraft close to the speed of light D) generating a shortcut between two distant parts of the universe through hyperspace
Which of the following wavelengths could NOT be present as a harmonic on a 2 m long string?
a. 4 m b. 2 m c. 1 m d. 0.89 m e. 0.5 m
A ball is thrown straight up, reaches a maximum height, then falls to its initial height. As the ball is going up
A. both its velocity and its acceleration point downward. B. its velocity points downward and its acceleration points upward. C. its velocity points upward and its acceleration points downward. D. both its velocity and its acceleration point upward.
How many different kinds of mesons can you make using only up, antiup, down, and antidown quarks?
A: 32 B: 16 C: 8 D: 4 E: 2