Indian Navy 10+2 B.Tech Cadet Atoms and Nuclei — practice questions

Explore 3 free Atoms and Nuclei questions in Indian Navy 10+2 B.Tech Cadet Physics. Open each question or exercise to read its content, reference answers and available explanation.

Practise Atoms and Nuclei with Quill →

Atoms and Nuclei questions and exercises with answers

Showing questions 1–3 of 3.

Lyman series transitions land at n = ___, lying in:Read the answer and worked solution →Activity of 1 gram of ²²⁶Ra (Avogadro = 6 × 10²³; T₁/₂ = 1600 yr):Read the answer and worked solution →Order the steps of EM wave generation by an accelerating chargeRead the answer and worked solution →

Worked practice questions

Lyman series transitions land at n = ___, lying in:

n = 1, ULTRAVIOLET
n = 2, visible
n = 3, infrared
n = 4, radio

Show answer and solution

Correct answer: A. n = 1, ULTRAVIOLET

**Lyman:** transitions to n = 1 (UV). **Balmer:** to n = 2 (visible, includes Hα = 656 nm). Paschen: to n = 3 (IR). **Brackett:** to n = 4 (far IR). Pfund: to n = 5.

Open this question →

Activity of 1 gram of ²²⁶Ra (Avogadro = 6 × 10²³; T₁/₂ = 1600 yr):

10²³ Bq
10⁵ Bq
Cannot determine
≈ 3.7 × 10¹⁰ Bq (1 Ci, by definition)

Show answer and solution

Correct answer: D. ≈ 3.7 × 10¹⁰ Bq (1 Ci, by definition)

N = (1 g / 226 g/mol) × 6 × 10²³ ≈ 2.66 × 10²¹ atoms. λ = 0.693 / (1600 × 365.25 × 86400) ≈ 1.37 × 10⁻¹¹ /s. A = λN ≈ 3.65 × 10¹⁰ Bq ≈ 1 Ci. (Original definition of curie.)

Open this question →

Order the steps of EM wave generation by an accelerating charge

Read exercise and reference answers

Steps

Charge accelerates, creating a changing electric field
Changing E-field induces a changing magnetic field
Changing B-field induces a changing E-field further away
The coupled E and B fields propagate outward as a wave
Wave travels in vacuum at c = 3×10⁸ m/s

Open this exercise →

How to practise

Choose a Atoms and Nuclei question and try to work out your answer.
Open the question to check the correct answer and read its worked solution.
Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.