CUET · PHYSICS · PYQ PAPER 2023

Calculate the separation of two points on moon that can be resolved using 600 cm telescope. Given distance of moon from earth \(= 3.8 \times 10^{10}\) cm. The wavelength most sensitive to eye is \(5.5 \times 10^{-5}\) cm.

A 4180 cm
B 2140 cm
C 3120 cm
D 1890 cm

Verified Solution

Answer & Solution

Correct Answer

(A) 4180 cm

Step-by-step Solution

Detailed explanation

\( \theta = 1.2 \frac{\lambda}{D} \) \( x = \theta L \) \( x = 1.2 \frac{\lambda}{D} L \) \( x = 1.2 \times \frac{5.5 \times 10^{-5} \text{ cm}}{600 \text{ cm}} \times 3.8 \times 10^{10} \text{ cm} \) \( x = 4180 \text{ cm} \)

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.

Same subject

Out of the following statements, which statements explain the difference between forward biasing and reverse biasing in a p-n junction correctly?

Forward biasing in a p-n junction	Reverse biasing in a p-n junction
(A) p-side is connected to the +ve terminal and n-side to the -ve terminal of the battery.	p-side is connected to the -ve terminal and n-side to the +ve terminal of the battery.
(B) Depletion layer becomes thicker.	Depletion layer becomes thin.
(C) Resistance across the p-n junction increases.	Resistance across the p-n junction decreases.
(D) the current is due to majority charge carriers.	the current is due to minority charge carriers.

Choose the correct answer from the options given below:

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