Which of these is a type of telescope?

a,) radio
b,) emitting
c,) absorbing
d,) intergalactic

stay tuned for more questions, i like to ask them to give points : )

What would be the result of an alpha particle coming into a magnetic field? a) the alpha particle will stop moving. b) the alpha particle will reverse its direction. c) the alpha particle will be deflected in a curve path. d) the alpha particle will continue to travel in a straight line.

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?

How to tell if two objects are in thermal equilibrium 1.the objects have the same temperature 2.the objects are the same size 3.the objects are touching each other 4.the objects temperatures are changing