Define the following terms:
$(a)$ Ground waves
$(b)$ Trade winds
$(a)$ Ground waves
$(b)$ Trade winds
(N/A) Ground waves: These are radio waves that travel along the surface of the Earth. They are typically used for low-frequency and medium-frequency communication. Because they follow the curvature of the Earth,they can travel beyond the horizon,but they are heavily attenuated by the Earth's surface.
$(b)$ Trade winds: These are prevailing patterns of easterly surface winds found in the tropics,within the lower portion of the Earth's atmosphere,in the lower section of the troposphere near the Earth's equator. They blow from the subtropical high-pressure belts towards the equatorial low-pressure belt.
$(b)$ Trade winds: These are prevailing patterns of easterly surface winds found in the tropics,within the lower portion of the Earth's atmosphere,in the lower section of the troposphere near the Earth's equator. They blow from the subtropical high-pressure belts towards the equatorial low-pressure belt.
Explore More
Similar Questions
$A$ carrier wave of peak voltage $60 \,V$ is used to transmit a message signal. Then the peak voltage of the modulating signal in order to have a modulation index of $90 \%$ is (in $\,V$)
The mathematical form of an $AM$ wave is given by $e = 50 (1 + 0.5 \sin(2\pi \times 5 \times 10^3 t)) \sin(31.4 \times 10^6 t) \text{ V}$. The frequencies of the $LSB$ and $USB$ in the given $AM$ wave are,respectively,....... and ....... .
Medium
View SolutionThis question has Statement-$1$ and Statement-$2$. Of the four choices given after the statements,choose the one that best describes the two statements.
Statement-$1$: Sky wave signals are used for long-distance radio communication. These signals are,in general,less stable than ground wave signals.
Statement-$2$: The state of the ionosphere varies from hour to hour,day to day,and season to season.
Statement-$1$: Sky wave signals are used for long-distance radio communication. These signals are,in general,less stable than ground wave signals.
Statement-$2$: The state of the ionosphere varies from hour to hour,day to day,and season to season.
MediumAIEEE 2011
View SolutionFrequencies in the $UHF$ range normally propagate by means of:
Match Column $A$ (layers in the ionosphere for skywave propagation) with Column $B$ (their height range).Column $A$ Column $B$ $A$. $D$-layer $I$. $250-400 \ km$ $B$. $E$-layer $II$. $170-190 \ km$ $C$. $F_1$-layer $III$. $95-120 \ km$ $D$. $F_2$-layer $IV$. $65-75 \ km$
| Column $A$ | Column $B$ |
| $A$. $D$-layer | $I$. $250-400 \ km$ |
| $B$. $E$-layer | $II$. $170-190 \ km$ |
| $C$. $F_1$-layer | $III$. $95-120 \ km$ |
| $D$. $F_2$-layer | $IV$. $65-75 \ km$ |
Vedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo