Sources are coherent if
A)
the distance to them is the same.
B)
they do not come from lasers.
C)
they have a zero phase difference.
D)
they have a constant phase difference.
E)
they only come from lasers.
D
You might also like to view...
A material with an interatomic potential perfectly symmetric about the equilibrium interatomic separation would have a coefficient of thermal expansion equal to _____________.
Fill in the blank(s) with the appropriate word(s).
Car A is traveling at twice the speed of car B. They both hit the brakes at the same time and decrease their velocities at the same rate. If car B travels a distance D before stopping, how far does car A travel before stopping?
A) 4D B) 2D C) D D) D/2 E) D/4
A planet has the orbit shown below. Use the 8 labeled points to answer all questions
The wavelength of a coherent laser is 628 nm. What energy difference exists between the upper excited state involved and the lower unexcited ground state? (h = 6.63 × 10^-34 J×s, c = 3.00 × 10^8 m/s, 1 eV = 1.60 × 10^-19 J, and 1 nm = 10-9 m)
a. 1.86 eV c. 1.75 eV b. 1.81 eV d. 1.98 eV