Which, if any, of the following is/are coherent light waves? A) light produced i

Question

Which, if any, of the following is/are coherent light waves?

A) light produced in an incandescent light bulb with a tungsten (W) filament
B) light produced by a candle
C) light produced by a firefly
D) light produced by a Coleman propane gas lantern
E) two radio antennas connected to the same LC-oscillator circuit
F) light produced in a Nd:YAG laser
G) light produced in a helium-cadmium (HeCd) metal-vapor laser
H) light from a titanium sapphire (Ti:sapphire) laser
I) sound produced by two loudspeakers receiving the same pure frequency signal from an audio amplifier

Thus far I have tried three things and all have been incorrect:

A) FALSE
B) FALSE
C) FALSE
D) FALSE
E) TRUE
H) TRUE
I) TRUE
J) TRUE
H) TRUE
I) TRUE

^ and that is incorrect. I have also tried the same exact answer changing letter C. to TRUE and that also is incorrect. Finally, my friend attempted an answer where F, G, and H only were put as TRUE and everything else was answered as FALSE. If someone could help, you would be my pedagogical hero. Thanks.

Explanation / Answer

A. true B. true C. true D. true e. false h.false i false j false h false k false

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