CUET · PHYSICS · PYQ PAPER 2023

Speed of Electromagnetic wave is not the same :

A in all media
B for all intensities in vacuum
C for all frequencies in vacuum
D for all wavelengths in vacuum

Verified Solution

Answer & Solution

Correct Answer

(A) in all media

Step-by-step Solution

Detailed explanation

While all electromagnetic waves travel at the same constant speed ( \(c \approx 3 \times 10^8 m / s\) ) in a vacuum, their speed decreases when they enter a material medium like glass or water. This change is determined by the medium's refractive index ( \(n\) ) using the…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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List-I (Series)	List-II (Values of \( n_1 \) and \( n_2 \) in Bohr's formula)
(A) Lyman	(I) \( n_1=4, n_2 \geq 5 \)
(B) Balmer	(II) \( n_1=3, n_2 \geq 4 \)
(C) Paschen	(III) \( n_1=2, n_2 \geq 3 \)
(D) Brackett	(IV) \( n_1=1, n_2 \geq 2 \)

Choose the correct answer from the options given below:

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B. Magnetic field due to a circular coil	II. \(\frac{q B}{2 \pi m}\)
C. Magnetic field inside a toroid	III. \(\frac{\mu_0 N I}{2 \pi R}\)
D. Voltage sensitivity	IV.\(\frac{\mu_0 I}{2 R}\)

Choose the correct answer from the options given below:

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