Công thức nào sau đây dùng để tính được bước sóng của mạch chọn sóng máy thu vô tuyến điện ?
A. λ = ![](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2020442752056319964486/image20204427520563199644863945351.png)
![](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2020442752056319964486/image20204427520563199644863945351.png)
B. λ = ![](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2020442752056319964486/image20204427520563199644865680331.png)
![](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2020442752056319964486/image20204427520563199644865680331.png)
C. λ = ![](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2020442752056319964486/image20204427520563199644867415301.png)
![](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2020442752056319964486/image20204427520563199644867415301.png)
D. λ = ![](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2020442752056319964486/image20204427520563199644864905171.png)
![](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2020442752056319964486/image20204427520563199644864905171.png)
Đáp án và lời giải
Đáp án:B