Предмет: Физика, автор: ГригорьеваЛилия

если поверхность меди облучена излучением с длиной волны 400нм,то имеет ли место при этом фотоэффект?

Ответы

Автор ответа: tana20101997

Энергия кванта E=h*c/L=6,62*10^-34*3*10^8/400*10^-9=5*10^-19 Дж
Работа выхода из меди A=4,4 эВ=7*10^-19 Дж
Так как E<A ответ нет

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Математика, автор: ailitasajhetdinova

Запишите 274 см в метрах,предварительно округлив до сотен

6 лет назад

Предмет: Английский язык, автор: AliGatoR153

Two years ago I … my old aunt in a small old town. *
visit
visited
visitted
didn't visited

One day my aunt asked me: " … the flowers in the garden yesterday?" *
Did you water
You watered
Did you watered
You did water

But in those days my aunt was so weak, that she … any work in the garden. *
couldn't do
cannot do
couldn't did
cannot did

So I … to take care of her flowers too. *
tried
tryed
try
trew

hang *
hung / hung
hurt / hurt
made / made
hid / hidden
could / could

see *
read / read
met / met
sat / sat
flew / flown
saw / seen

Every year The Guinness Book of World Records announces ... person in the world. *
more higher
the highest
highest
highestest

Jim’s is ... restaurant in our city. *
the expensiviest
the more expensive
expensivest
the most expensive

For ... information do not hesitate to call our assistant. *
farther
furthest
fastest
further

The students ___ a few mistakes in the dictation. *
did
made
make
do

They … the TV when I came *
Watched
Were watching
Have watched
Watch

My parents … in 1970 *
Got married
Get married
Were getting married
Getting married

What … last Saturday? *
Were they buying
They bought
Did they buy
They were buying

_____ you read when you were 5? *
Can’t
Couldn’t
Could
Can

We _____ call you yesterday, because the connection was bad. *
can’t
could
can
couldn’t

The cake … ready tomorrow. *
Willn't
Won’t be
Isn’t
Doesn’t

They … lunch at two every day. *
Will have
Doesn’t have
Have
Won’t have

How long … for me at the airport next Monday? *
will you wait
do you wait
shall you wait
does you wai

There are a lot of … on the floor. *
toys
toy
tois
a toys
His clothes … so dirty that I tried to stay away from him. *
are
were
is
was

6 лет назад

Предмет: Алгебра, автор: gdfjuyv503

Составь и реши задачу по выражению 26 х 5 - 26

6 лет назад

Предмет: Информатика, автор: Аноним

Сколько нулей в таблице истинности итоговой функции ?(А V В) Λ С
над В черточка

9 лет назад

Предмет: Геометрия, автор: Аноним

основание пирамиды квадрат со стороной 16 метров , а две её боковые грани перпендикулярные к плоскости основания. Найти площадь боковой поверхности пирамиды , если её высота 12 см

9 лет назад