Which of the following is a unit-vector?
A) ( - o)/t
B) /x
C) v cos ?
D) o + t
E) sin2? + cos2?
B
Physics & Space Science
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A radar receiver indicates that a pulse return as an echo in 20 ?s after it was sent. How far away is the reflecting object? (c = 3.0 × 108 m/s)
A) 1.5 km B) 3.0 km C) 6.0 km D) 9.0 km
Physics & Space Science
An electron in the hydrogen atom has a wavelength of 1.99 × 10-9 m. To what state of the hydrogen atom does this electron belong?
A) n = 1 B) n = 3 C) n = 4 D) n = 6 E) n = 8
Physics & Space Science
The electric field of a point charge has an inverse _____ behavior
a. r3 c. r b. r2 d. r1/2
Physics & Space Science
Each atom of the same element, zinc for example, has the same number of
A) electrons in the nucleus B) electrons in the valence bond level C) neutrons in the outer nuclear shell D) protons in the nucleus
Physics & Space Science