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8.Electromagnetic waves
easy
$1 \,kilo $ પરિભ્રમણ/સેકન્ડની આવૃત્તિથી દોલિત થતા વિદ્યુતભાર વડે વિકેરિત થતા વિદ્યુતચુંબકીય તરંગની તરંગલંબાઈ .....$km$
A
$100$
B
$200$
C
$300$
D
$400$
Solution
Stepl. Given data:
Frequency of the electromagnetic wave $f=1\,kilo\,cycles$ $/ s$ $=1 x 10^3$ cycles $/ s =10^3\,Hz$
Velocity of the electromagnetic wave is $c=3 \times 10^8\,m / s$
Step2. Find the wavelength of electromagnetic wave:
$\lambda=$ velocity/frequency
$=c / f$
$=\left(3 \times 10^8\right) / 10^3$
$=3 \times 10^5\,m$
$=300\,km$
Standard 12
Physics
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