The electron density of a layer of ionosphere at a height 150 km from the earth's surface is 9 × 109 per m 3. For the sky transmission from this layer up to a range of 250 km, The critical frequency of the layer is

Question

The electron density of a layer of ionosphere at a height 150 km from the earth's surface is 9 × 109 per m 3. For the sky transmission from this layer up to a range of 250 km, The critical frequency of the layer is (A) 2 Hz (B) 2.7 Hz (C) 2.78 kHz (D) 27 MHz

Tardigrade Admin · Accepted Answer

fc=9 √ N m =9 × √9 × 1010 =2.7 × 106 Hz =2.7 MHz

Q. The electron density of a layer of ionosphere at a height $150 km$ from the earth's surface is $9 \times 1 0^{9}$ per $m^{3}$ . For the sky transmission from this layer up to a range of $250 km$ , The critical frequency of the layer is

$2 Hz$

$2.7 Hz$

$2.78 k Hz$

$27 M Hz$

$f_{c} = 9 N_{m} = 9 \times 9 \times 1 0^{10}$
$= 2.7 \times 1 0^{6} Hz = 2.7 M Hz$

Q. The electron density of a layer of ionosphere at a height 150km from the earth's surface is 9×109 per m3. For the sky transmission from this layer up to a range of 250km, The critical frequency of the layer is

2Hz

2.7Hz

2.78kHz

27MHz