A nucleus of mass number A and atomic number Z contains
A. Z protons and A neutrons
B. A-Z protons and Z neutrons
C. Z protons and A-Z neutrons
D. A protons and Z neutrons
Answer: Option C
Solution (By JKSSB Mock Tests)
Atomic number Z = number of protons. Mass number A = protons + neutrons. So neutrons = A - Z. Electrons = Z in neutral atom. Isotopes same Z, different N.
Explanation:
T = 2π√(R/g) ≈ 5076 s ≈ 84.6 min for r ≈ Earth radius. Standard result. Memory aid: 'Low orbit: ~84 min; geostationary: 24 hours'. Orbital mechanics fact frequently tested in competitive exams.
Explanation:
A transformer operates on the principle of mutual induction. It consists of primary and secondary coils. When an alternating current flows through the primary coil, it generates a changing magnetic field. This fluctuating flux links with the secondary coil, inducing an alternating electromotive force (EMF) in it according to Faraday's Law.
No comments yet. Be the first to start the discussion!