Physics Test 80

Result

Physics Test 80

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Weekly Quiz Competition

Question 1
4 / -1

In the Young's double-slit experiment, the intensity of light at a point on the screen where the path difference is λ is K, (λ being the wave length of light used). The intensity at a point where the path difference is λ/4, will be :-

A
K

B
K/4

C
K/2

D
Zero

Solution

For path difference λ, phase difference = 2π rad.

For path difference λ/4, phase difference = π/2 rad.

As K = 4I₀. so, intensity at given point where path difference λ/4 is

K' = 4I₀cos²(π/2)^₌2I₀ = K/2
Question 2
4 / -1

During the propagation of electromagnetic waves in a medium :

A
Electric energy density is equal to the magnetic energy density

B
Both electric magnetic energy densities are zero

C
Electric energy density is double of the magnetic energy density

D
Electric energy density is half of the magnetic energy density.