1
KCET 2021
MCQ (Single Correct Answer)
+1
-0
Suppose that the electric field amplitude of electromagnetic wave is $$E_0=120 \mathrm{~NC}^{-1}$$ and its frequency $$f=50 \mathrm{~MHz}$$. Then, which of the following value is incorrectly computed?
2
KCET 2021
MCQ (Single Correct Answer)
+1
-0
The source of electromagnetic wave can be a charge
3
KCET 2020
MCQ (Single Correct Answer)
+1
-0
A light beam of intensity $$20 \mathrm{~W} / \mathrm{cm}^2$$ is incident normally on a perfectly reflecting surface of sides $$25 \mathrm{~cm} \times 15 \mathrm{~cm}$$. The momentum imparted to the surface by the light per second is
4
KCET 2019
MCQ (Single Correct Answer)
+1
-0
An antenna uses electromagnetic waves of frequency $$5 \mathrm{~MHz}$$. For proper working, the size of the antenna should be
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