Long range radio transmission is possible when the radiowaves are reflected from the ionosphere. For this to happen the frequency of the radiowaves must be in the range :
← JEE Main 2014 · 19 Apr · Shift 1
PhysicsSingle correct+4 / -1Question 29 of 90
JEE Main 2014 · 19 Apr · Shift 1, Physics question 29
Answer and worked solution
Official answer: B
Ionospheric reflection works from a few MHz to about 30 MHz. 8-25 MHz lies in that range; higher frequencies pass through, and lower ones are absorbed.
Topics:Propagation of EM waves