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Physics — Stream SX/SB

Electrodynamics, modern physics, waves, and thermodynamics for Class 12 / 1st-year college

Key Concepts

Electrostatics and current electricity
Magnetism and electromagnetic induction
Ray and wave optics
Modern physics: photoelectric effect and atomic models

Important Formulae

Coulomb's law	F = kq₁q₂/r²
Mirror / lens formula	1/f = 1/v − 1/u
Photon energy	E = hf = hc/λ
Bohr energy levels	E_n = −13.6/n² eV

Quick Tips

Master sign conventions in optics before attempting numericals.
Many SX questions blend two topics — read carefully for the link.

Sample Practice Questions

The charge of an electron is approximately:
- −1.6×10⁻¹⁹ C
- 9.1×10⁻³¹ C
- +1.6×10⁻¹⁹ C
- 6.6×10⁻³⁴ C
Show answer

Answer: −1.6×10⁻¹⁹ C
The lens (and mirror) formula is:
- 1/f = 1/v + 1/u
- 1/f = 1/v − 1/u
- f = v + u
- 1/f = u − v
Show answer

Answer: 1/f = 1/v − 1/u
The photoelectric effect demonstrates the:
- Wave nature of light
- Particle nature of light
- Magnetic nature of light
- Thermal nature of light
Show answer

Answer: Particle nature of light
The speed of light in vacuum is approximately:
- 3×10⁶ m/s
- 3×10⁸ m/s
- 3×10¹⁰ m/s
- 1.5×10⁸ m/s
Show answer

Answer: 3×10⁸ m/s

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Practice Questions

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Frequently Asked Questions

What are the key concepts in Physics — Stream SX/SB for KVPY?

Electrostatics and current electricity; Magnetism and electromagnetic induction; Ray and wave optics; Modern physics: photoelectric effect and atomic models.

Which formulae are important for Physics — Stream SX/SB in KVPY?

Coulomb's law: F = kq₁q₂/r²; Mirror / lens formula: 1/f = 1/v − 1/u; Photon energy: E = hf = hc/λ; Bohr energy levels: E_n = −13.6/n² eV.

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Physics