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Vedmedyk [2.9K]
3 years ago
11

Kevin is standing outside a railway station. He can know whether a train is approaching the station or departing from the sound

it makes. Which principle of sound waves is he using?
History
1 answer:
pickupchik [31]3 years ago
5 0
The Doppler Effect. When a train is approaching, the sound waves in front of it are "squished" and the sound of a train whistle will seem to be a higher pitch than the actual pitch of the whistle. If the train is departing, the sound waves will appear to be "stretched" and the sound will be lower than the actual pitch of the whistle. As the train passes by, the sound will shift from the higher pitch to the lower pitch, passing its true sound on the way.

Hope this helps! :)
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How did Valley Forge showcase General George Washington’s leadership?
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In December 1777, 12,000 men of Washington's continental army marched in Valley Forge to escape the British who had just captured the capital of the revolutionary state, Philadelphia. What followed was a brutal winter that should have decimated the army but instead the opposite happened, they came out stronger. This, was as a result of Washington's leadership and the tactics of Friedrich Wilhelm Baron von Steuben.

But what made Washington so effective;

  • Inspirational/ Motivational

George Washington was an inspirational leader who throughout the war managed to inspire and motivate his troops and when this was massively needed in Valley Forge, he did not falter. His army had been defeated time and again and now were in a very precarious position yet they did not desert and break apart. This was because Washington was able to inspire them and just as he did in the battle at Monmouth, he did again here.

In the camp, Washington also initiated some recreational activities to keep the spirits of the men up such as theatre. At Valley Forge Washington had Addison’s play “Cato” acted.  

  • Effective

As soon as they arrived at Valley Forge George Washington did not waste time in getting the camp organized. Within days it was reported that over 1,600 log huts had been built with Washington even giving exact measurements for the houses. Roads and trenches were also built such that the place looked like a small city.

  • Tactical

Even the choosing of Valley Forge as their base was a show of his leadership abilities because Washington proved his tactical mantle when he picked this location. It was chosen such that Philadelphia was close enough to watch the British and yet far enough that the British could not launch a surprise attack.

  • Willing to accept help

Some leaders are too proud to accept help but George Washington was not like that. When the Prussian officer Friedrich Wilhelm Baron von Steuben offered to transform the Americans into a solid and modern fighting force, he did not let pride get in his way but rather support the Prussian who then went on the make the men of the Continental army, a brilliant modern force.

Washington marched into Valley Forge with some people doubting his leadership acumen and even thinking of replacing him but marched out of Valley Forge at the head of an army that supported him and could not wait to beat the British under him. This on its own is perhaps the greatest showcase of his leadership.

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