1

JEE Main 2021 (Online) 25th February Evening Shift

Numerical

+4

-1

The wavelength of an X-ray beam is 10$$\mathop A\limits^o $$. The mass of a fictitious particle having the same energy as that of the X-ray photons is $${x \over 3}h$$ kg. The value of x is __________. (h = Planck's constant)

Your input ____

2

JEE Main 2021 (Online) 24th February Evening Shift

Numerical

+4

-1

An electromagnetic wave of frequency 3 GHz enters a dielectric medium of relative electric permittivity 2.25 from vacuum. The wavelength of this wave in that medium will be _________ $$\times$$ 10

^{$$-$$2}cm.Your input ____

3

JEE Main 2021 (Online) 24th February Morning Shift

Numerical

+4

-1

An electromagnetic wave of frequency 5 GHz, is travelling in a medium whose relative electric permittivity and relative magnetic permeability both are 2. Its velocity in this medium is ____________ $$\times$$ 10

^{7}m/s.Your input ____

4

JEE Main 2020 (Online) 6th September Morning Slot

Numerical

+4

-0

Suppose that intensity of a laser is $${{315} \over \pi }$$ W/m

The rms electric field, in units of V/m associated with this source is close to the nearest integer is __________.

$$ \in $$

^{2}.The rms electric field, in units of V/m associated with this source is close to the nearest integer is __________.

$$ \in $$

_{0}= 8.86 × 10^{–12}C^{2}Nm^{–2}; c = 3 × 10^{8}ms^{–1})Your input ____

Questions Asked from Electromagnetic Waves (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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