St. Britto Hr. Sec. School - Madurai
12th Physics weekly Test -1 ( Electromagnetic waves )-Aug 2020
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The relation between velocity of light, permeability and permittivity of free space in________.
\({ C }^{ 2 }=\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \)
\(C=\frac { 1 }{ { \mu }_{ 0 }{ \varepsilon }_{ 0 } } \)
\({ \mu }_{ 0 }={ \varepsilon }_{ 0 }c\)
\({ \varepsilon }_{ 0 }={ \mu }_{ 0 }c\)
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__________discovered electromagnetic induction.
Faraday
Maxwell
Ampere
Hertz
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The wavelength range of microwave is _______m
10-8 to 0.35
10-3 to 0.3
10-8 to 10-6
10-3 to 10-1
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The phase difference between electric and magnetic field vectors in the electromagnetic waves?
\(\frac{\pi}{4}\)
\(\frac{\pi}{2}\)
\(\pi\)
zero
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The absorption spectra are characteristic of the __________.
source
absorbing substance
time of travel from source to screen
spectrometer used to study the spectrum
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The dark lines in the solar spectrum are called _______ lines.
Fresnel
Newton
Compton
Fraunhofer
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Which of the following E.M waves has the longest wavelength?
Radio waves
IR
X-rays
visible
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Which part of Electromagnetic is absorbed from sunlight by ozone layer?
(i) Write its source and
(ii) mention its uses. -
What are electromagnetic waves?
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Which part of the Electromagnetic spetrum spectrum is used in operating a RADAR and why?
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What is displacement current?
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Arrange the Electromagnetic waves in order of
(i) increasing frequency
(ii) decreasing wavelength. -
What is the orgin of displacement currtent?
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Consider a parallel plate capacitor which is maintained at potential of 200 V. If the separation distance between the plates of the capacitor and area of the plates are 1 mm and 20 cm2. Calculate the displacement current for the time in μs.
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The charge on a parallel plate capacitor varies as q=qo cos 2\(\pi \gamma \)t. The plates are very large and close together. (area-A. separation - d) find the displacement current through the capacitor?
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Write an expression for the momentum of Electromagnetic wave.
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Write the frequency source of production and uses of Ultraviolet radiation.
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Write down Maxwell equations in integral form.
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What is emission spectra?. Give their types.
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An electromagnetic wave is traveling in vacuum with a speed 3 x 108 m/s. find its velocity in a medium having relative electric and magnetic permeability 2 and 1respectively.
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A pulse of light of duration 10−6 s is absorbed completely by a small object initially at rest. If the power of the pulse is 60 × 10−3 W, calculate the final momentum of the object.
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Show how to generalize Ampere's circuital law to include the term due to displacement current?
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About 5 % of the power of a 100 W light bulb is connected to visible radiation. What is the average intensity of visible radiation at the distance of 1m from the bulb?