Answer:
Answer is November 11 1918
Explanation:
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The answer would be sound waves.
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The Portuguese man was Vasco da Gama.
<h3>Who was Vasco da Gama?</h3>
Vasco da Gama was the first European and Portuguese explorer, who reached to the India though the sea.
He was the first discoverer who link Europe and India by an Ocean route. He completed his long journey by way of Cape.
Later on, he died on Dec. 24, 1524. due to some illness.
Learn more about the Vasco da Gama here:-
brainly.com/question/2715544
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