Предмет: Физика, автор: marselmigranov

Помогите с 14 заданием заранее спасибо

Приложения:

antpu238: пол страницы не видно (
marselmigranov: соотвецтвует частота .... Гц
marselmigranov: это не влезло

Ответы

Автор ответа: antpu238
0
ешкин кот! одно же действие
\nu =  \frac{c}{\lambda}
\nu = \frac{ 3*10^8}{0.4*10^-^6}= 7.5*10^{14} Гц
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помогите пожалуйста
Exercise 1
Tick the correct sentences. If a tense is not correct, underline it and write the correct form.
Example:
I have never been seeing a ghost. have never seen
1) Look. The girl has been buying four dictionaries. ........................................................................
2) I haven't eaten anything since I arrived. ........................................................................
3) Let's stop for a while. You've driven all morning. ........................................................................
4) Have you ever been sleeping in a tent? ........................................................................
5) He's been sleeping too long. Wake him up! ........................................................................
6) I'm sorry. How long have you been waiting? ........................................................................
7) I've been meeting your sister several times. ........................................................................
8) I've been knowing him since he was born. ........................................................................
9) Help yourself. Mum has been making delicious toasts. ........................................................................
10) He is sunburnt. He's been lying on the beach all day. ........................................................................
11) I've gone to France for five years now. ........................................................................
12) Don't give up. You haven't been trying this way yet.