7a) At what point in a typical house contaning the usual electrical equipment would you expect to find electromagnetic radiation of the following wavelengths? 1)5*10^-7 m 2)3*10^-10 m 3)2*10^-6 m 4)0.12m 5)1.5*10^3 m
5b)A metal plate is illuminated with electromagnetic radiation of waveleneth 190nm. The metal has a work function of 7.9*10^-19
2)Show that the metal plate will emit photoelectrons when illuminated with radiation of this wavelength.
3 physics ques to ask!!
2006-10-27 12:38 am
回答 (1)
2006-11-04 5:34 pm
✔ 最佳答案
1)visible light = 3.8 x 10^-7 nm to 7.8 x 10^-7 nm
5 x 10^-7 m = blue light
TV, computer screens etc.
2)
3*10^-10
Xrays
well um i don't think you can find x-rays at home..
3)
2^10^-6
Infrared
Remote controls, any warm or hot electrical equipment
4)
0.12 m
= 1.2 x 10^-1
Microwaves
Microwave in the kitchen
5)
1.5*10^3 m
Radiowaves
Radios, TV receiver
------------------------------------------------------
sorry i don't know the rest
收錄日期: 2021-04-13 14:45:15
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061026000051KK02072