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Published on: 27/08/2019
Electromagnetic Waves
Download Tamil Nadu 12th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
Which of the following electromagnetic waves has the highest frequency?
radio waves
micro waves
X- rays
૪-rays
2.
Electromagnetic waves are produced by _____________.
static charge
moving charge
an accelerating charge
chargeless particles
3.
In an electromagnetic wave traveling in free space the rms value of the electric field is 3 V m−1. The peak value of the magnetic field is _____.
1.414 x 10-8 T
1.0 x 10-8 T
2.828 x 10-8 T
2.0 x 10-8 T
4.
The electric and the magnetic fields, associated with an electromagnetic wave, propagating along negative X axis can be represented by _____.
\(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { k } \)
\(\vec { E } ={ E }_{ 0 }\hat { k } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)
\(\vec { E } ={ E }_{ 0 }\hat { i } \) and \(\vec { B } ={ B }_{ 0 }\hat { j } \)
\(\vec { E } ={ E }_{ 0 }\hat { j } \) and \(\vec { B } ={ B }_{ 0 }\hat { i } \)
5.
Consider an oscillator which has a charged particle oscillating about its mean position with a frequency of 300 MHz. The wavelength of electromagnetic waves produced by this oscillator is _____.
1 m
10 m
100 m
1000 m
6.
Fraunhofer Lines
7.
Line Absorption spectra
8.
Band Emission spectra of H, gas
9.
Continuous Emission spectra
10.
U- V Radiation
1.
(d)
૪-rays
2.
(c)
an accelerating charge
3.
\(B_o=\frac{E_o}{C}=\frac{\sqrt2E_{rms}}{C}\)
\(B_o=\frac{\sqrt2 \times 3}{3 \times10^8}=1.414 \times10^{-8}T\)
4.
\( { E } ={ E }_{ 0 }\hat { k } \) and \({ B } ={ B }_{ 0 }\hat { j } \)
5.
ג = \(\frac{c}{f}=\frac{3 \times10^8}{300 \times 10^6}=1 m\)
6.
Solar spectrum
7.
Spectrum of Carbon Arc
8.
Spectra of H2 gas
9.
Incandescent solids
10.
6 x 10-10m to 4 x 10-7m
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Tamilnadu Stateboard 12th Standard Subjects
Maths
Chemistry
Physics
Biology
Computer Science
Business Maths and Statistics
Economics
Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
Economics
Maths
Chemistry
Physics
Computer Technology
History
Accountancy
Tamil
English
French
Tamilnadu Stateboard Standards
