Sound WavesHard
Question
In short wave communication wave of which of the following frequencies will be reflected back by the ionospheric layer having electron density 1011 per m3 ?
Options
A.2 MHz
B.10MHz
C.12 MHz
D.18 MHz
Solution
If n be the frequency beyond which it will leakout to the upper region of atmosphere (this limit is known as critical) frequency then
n = 9 √N
N is the charge density of ionospere n = 9
= 9 × 105 × 3.12 = 2.7 × 106
   = 2MHz
n = 9 √N
N is the charge density of ionospere n = 9
= 9 × 105 × 3.12 = 2.7 × 106    = 2MHz
Create a free account to view solution
View Solution FreeMore Sound Waves Questions
The stationary waves set up on a string have the equation y = (2 mm) sin[(6.28 m-1)x]cos (ωt). This stationary wave...When temperature increases, the frequency of a tuning fork...The equation of a wave traveling along the positive x-axis, as shown in figure at t = 0 is given by : -...A transverse wave, traveling along the positive x-axis, given by y = A sin(kx - ωt) is superposed with another wave...If a simple pendulum oscillates with an amplitude of 50mm and time period of 2 sec then its maximum velocity is :...