in the early twentieth century, what two experiments involving light and matter could not be explained by the wave theory of light?

Photoelectric effect and emission spectrum of the hydrogen atom.

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some american cities felt workers were being oppressed by business monopolies

accomplishment : zachary taylor’s was a national war hero in his battle in an mexican war

explanation:

he was known as a national war hero for his battles in the mexican war, taylor was elected as the 12th president of the united states in 1849. he led the nation during its debates on slavery and southern secession. after serving only 16 months in office, taylor died from cholera morbus on july 9,