How does the effective power radiated by an antenna vary with wav… - Vidyadip

Question

How does the effective power radiated by an antenna vary with wavelength?

✓

Answer

To transmit a signal, an antenna or an aerial is needed.
2. Power radiated from a linear antenna of length $I$ is, $P \propto\left(\frac{l}{\lambda}\right)^2$ where, $\lambda$ is the wavelength of the signal.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following in Brief" from Electromagnetic Waves and Communication System→Electromagnetic Waves and Communication System — all question types→Physics STD 11 Science question papers→Maharashtra Board STD 11 Science question papers→Maharashtra Board question paper generator→

Similar questions

A constantan wire of length $50 \ cm$ and $0.4 \ mm$ diameter is used in making a resistor. If the resistivity of constantan is $5 \times 10^{-7} m$, calculate the value of the resistor.

Three resistors $10\ Ω, 20\ Ω$ and $30\ Ω$ are connected in series combination.
i. Find equivalent resistance of series combination.
ii. When this series combination is connected to $12\ V$ supply, by neglecting the value of internal resistance, obtain potential difference across each resistor.

State an expression for electric field on the surface of the sphere due to a positive point charge placed at its centre.

The magnetic field of an $EM$ wave travelling along $X-$axis is $\vec{B}=\hat{k}\left[4 \times 10^{-4} \sin (\omega t-k x)\right]$. Here $B$ is in tesla, $t$ is in second and $x$ is in $m .$ Calculate the peak value of electric force acting on a particle of charge $5 \mu C$ travelling with a velocity of $5 \times 10^5 m / s$ along the $Y-$axis.

What is the magnitude of a point charge chosen so that the electric field 50 cm away has magnitude 2.0 N/C?

State disadvantages of semiconductor devices.

Calculate the speed of a satellite in an orbit at a height of $1000\ km$ from the Earth’s surface. $M_E = 5.98 \times 10^{24}\ kg, R = 6.4 \times 10^6\ m$.

What is systematic error? Classify errors into different categories.

The critical velocity of a satellite revolving around the Earth is $10 \ km/s$ at a height where $g_h = 8 \ m/s ^2.$ Calculate the height of the satellite from the surface of the Earth. $(R = 6.4 \times 10^6 m)$

If $\overrightarrow{ v _1}=3 \hat{i}+4 \hat{j}+\hat{k}$ and $\overrightarrow{ v _2}=\hat{i}-\hat{j}-\hat{k}$, determine the magnitude of $\overrightarrow{ v _1}+\overrightarrow{ v _2}$