Physics - EM Waves Question with Solution | TestHub
PhysicsEM WavesElectromagnetic wavesHard2 minPYQ_2013
PhysicsHardsingle choice
Assertion : A laser beam of power can drill holes through a metal sheet, whereas a torch-light cannot. Reason : The frequency of laser light is much higher than that of torch light.
Options:
Answer:
C
Solution:
A laser is a highly monochromatic and nearperfect parallel beam of light, due to which the beam can be focussed by a converging lens to a very small spot. As the intensity of the beam is too high, it can drill holes through a metal sheet even if the power is . But even a torch-light of power cannot drill holes in such a metal sheet, because the light is less intense and the beam is not parallel.
Stream:AIIMSSubject:PhysicsTopic:EM WavesSubtopic:Electromagnetic waves
⏱ 2mℹ️ Source: PYQ_2013
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