Sort of. Almost all Wireless N routers support the G protocol aswell, so will be compatible with these devices. Whether they benefit from the extra range, I do not know.
Yes it is backwards compatible
Yes, it is.
Yes, a wireless n adapter is backwards compatible with wireless g. Check the box you are buying and it will tell you if it is compatible with which wireless ranges.
Yes they are all backwards compatible. N to G to B. BUT, your N network will slow down to G speeds every time the G device connects unless you have a MIMO set up.
No. But if the wireless router is N, then it should downgrade to G when needed. It's automatic but the speed and signal is not as good.
As far as I understand it, 802.11g will work in a backwards compatible nature with 802.11b. Further, if an 802.11n device can be made to run in a 802.11g 'mode' then it should be able to work with an 802.11b device. The primary difference between 802.11g and 802.11n devices is maximum speed and resistance to interference from other wireless devices like cell phones. Most users will find 802.11g and 802.11n devices comparably sufficient provided the other connecting hardware is compatible (see note about 802.11g being backwards compatible with 802.11b above).
No, they are not. But many wireless adapters of N-type can work with A-type networks as well.
No, HO and N scale trains are not compatible.
n is any number, (it is not n because it is the first letter of the word number,because the 'n' could be a 'q' or a 'h') Basically, 'n' is any number, and usually when working with algebra, it is easiest to work backwards
Rather no than yes. It will work if the router is configured to work in the "G" mode.
It should be, just make sure that your router is configured to work with both G as well as N networks.
Any extender that operates on the same standard (A, B, G, N) will work.