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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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