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Physics - EM Waves Question with Solution | TestHub

PhysicsEM WavesElectromagnetic wavesEasy2 minPYQ_2018

PhysicsEasysingle choice

Assume that a radio station is about $200 km$ away from your location and the station operates at $972 kHz$ . How long does it take for an electromagnetic signal to travel from the station to you and how many wave crests does it send out per second?

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Answer:

Solution:

Time taken by wave to travel $= \frac{200 km}{3 \times 1 0 ^{5} km s ^{- 1}} = 6.667 \times 1 0^{- 4} s \approx 666 μ s$ Number of crests per second $=$ Frequency Frequency $= 972 kHz = 9.72 \times 1 0^{5} Hz$ $∴$ There are $9.72 \times 1 0^{5}$ crests per second.

Stream:AIIMSSubject:PhysicsTopic:EM WavesSubtopic:Electromagnetic waves

⏱ 2mℹ️ Source: PYQ_2018

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