cp1998
Answered

9) Which of these would BEST describe an immediate effect of the invention and mass production of the light bulb?

Atime became standardized
Bagriculture worked longer hours
Crailroad companies expanded routes
Dlonger factory hours for all workers

Verified Answer :

chanit
Dlonger factory hours for all workers :)
millermoldwarp

Correct answer:

D. longer factory hours for all workers

When Edison invented the bulb the duration of this was not significant, so he and other scientists had to work on the life of the bulb. After discovering that the filament that gave the bulb the longest life was the carbon filament. It gave a useful life of up to 1200 hours so the working days could be extended much more.

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