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Консультация № 173838
30.10.2009, 13:33
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4
1
348. В однородное электрическое поле напряженностью Е = 200 В/м влетает (вдоль силовой линии) электрон со скоростью v0 = 2 Мм/с. Определить расстояние l, которое пройдет электрон до точки, в которой его скорость будет равна половине начальной.
Обсуждение
30.10.2009, 21:38
общий
31.10.2009, 00:48
это ответ
Здравствуйте, Вика.
Дано:
Е = 200 В/м
v0 = 2 Мм/с=2*106 м/с
v=v0/2
Найти: l
Решение:
Нам потребуются
заряд электрона -e=-1.6*10-19 Кл
масса электрона m=9.1*10-31 кг
Работа поля по торможению электрона
A= -eU= -e*E*l (1)
В то же время, работа поля равна изменению кинетической энергии электрона
A=[$916$]EK=1/2 * m(v2-v02)=1/2 * (1/4*v02-v02)= -3/8 * mv02 (2)
Приравняв правые части выражений (1) и (2), вразим l
l=3mv02/(8eE) =2.1*10[sup]-8[/sup] м 0,043 м = 4,3 см
Удачи
Дано:
Е = 200 В/м
v0 = 2 Мм/с=2*106 м/с
v=v0/2
Найти: l
Решение:
Нам потребуются
заряд электрона -e=-1.6*10-19 Кл
масса электрона m=9.1*10-31 кг
Работа поля по торможению электрона
A= -eU= -e*E*l (1)
В то же время, работа поля равна изменению кинетической энергии электрона
A=[$916$]EK=1/2 * m(v2-v02)=1/2 * (1/4*v02-v02)= -3/8 * mv02 (2)
Приравняв правые части выражений (1) и (2), вразим l
l=3mv02/(8eE) =
Удачи
Об авторе:
С уважением
shvetski
С уважением
shvetski
Неизвестный
30.10.2009, 23:07
общий
спасибо
1)а почему v0=2*106? а не 2*10-3?
2) при подстановки значений в формулу мой ответ отличается от вашего
1)а почему v0=2*106? а не 2*10-3?
2) при подстановки значений в формулу мой ответ отличается от вашего
Неизвестный
30.10.2009, 23:22
общий
аа, Мм - мега метры? множитель 106.
Тогда ответ получается 4,3 м.
Тогда ответ получается 4,3 м.
Форма ответа
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