1st statement:
Lower frequency radio waves are more suitable to household cordless telephone sets for better quality
2nd statement:
Waves with longer wavelengths diffracts more around a corner of an obstacle.

why the ans is A ( True ; True , 2nd statement is a correct explanation of the 1st statement )
not D ( False ; True )
個人認為無線電話用 electromagnetic wave 已經有穿透力,
冇需要走去借 wavelength 長既波勁 d 既 diffraction 令個電話易接收d喎 banghead

問題係無線電話多數係用radio wave...
根本唔關em wave事

Radio waves occupy the a part of EM spectrum. LOW FREQUENCY radio waves has a relatively longer wavelength which can diffract more around corners.
Here the household cordless phone doesn't refer to those mobile phones (Sony, Nokia..)....
* Note: Nowadays household cordless phone uses radio waves of higher frequency since these waves have higher penetrating power through the main walls. e.g.: 1.88GHz,2.4GHz.. So the issue is two-sided=.=...

From wikipedia:
"Radio waves are electromagnetic waves occurring on the radio frequency portion of the electromagnetic spectrum"
http://en.wikipedia.org/wiki/Radio_waves

我會咁睇…
一來，radio wave個frequency之低，應該會令d photon冇足夠能力穿牆
事實上em wave都係去到X-rays、gamma先會consider個penetrating power
二來，個phone講緊只係household，本身強度都唔會大

ATE31 :Radio waves occupy the a part of EM spectrum. LOW FREQUENCY radio waves has a relatively longer wavelength which can diffract more around corners.
Here the household cordless phone doesn't refer to those mobile phones (Sony, Nokia..)....
* Note: Nowadays household cordless phone uses radio waves of higher frequency since these waves have higher penetrating power through the main walls. e.g.: 1.88GHz,2.4GHz.. So the issue is two-sided=.=...

From wikipedia:
"Radio waves are electromagnetic waves occurring on the radio frequency portion of the electromagnetic spectrum"
http://en.wikipedia.org/wiki/Radio_waves

*~誰@359~ :我會咁睇…
一來，radio wave個frequency之低，應該會令d photon冇足夠能力穿牆
事實上em wave都係去到X-rays、gamma先會consider個penetrating power
二來，個phone講緊只係household，本身強度都唔會大

我知條題目係講緊 household phone