Photoelectric Effect
ICSE · Class 12 · Physics
Most important questions from Photoelectric Effect for ICSE Class 12 Physics board exam 2026. MCQs, short answer, and long answer questions with marks.
Interactive on Super Tutor
Studying Photoelectric Effect? Get the full interactive chapter.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan — built for important questions and more.
1,000+ Class 12 students started this chapter today
Sample Questions
A photon has wavelength 3300 Å. Find its momentum in kg m s^-1.
Show answer
2.0 × 10^-27 kg m s^-1
Use p = h/λ. Convert 3300 Å to 3300 × 10^-10 m = 3.3 × 10^-7 m. Then p = 6.6 × 10^-34 / 3.3 × 10^-7 = 2.0 × 10^-27 kg m s^-1.
A photon of wavelength 3300 Å has equivalent mass. Find its equivalent mass in kg.
Show answer
6.67 × 10^-36 kg
Use m = h/(cλ). With λ = 3.3 × 10^-7 m, m = 6.6 × 10^-34 / (3.0 × 10^8 × 3.3 × 10^-7) = 6.67 × 10^-36 kg.
A photon has energy 10.2 eV. Find its momentum in kg m s^-1 using E = pc.
Show answer
5.44 × 10^-27 kg m s^-1
Convert 10.2 eV to joule: 10.2 × 1.6 × 10^-19 = 1.632 × 10^-18 J. Then p = E/c = (1.632 × 10^-18)/(3.0 × 10^8) = 5.44 × 10^-27 kg m s^-1.
An isolated hydrogen atom emits a photon of energy 10.2 eV. Find the kinetic energy of the recoil atom in joule.
Show answer
9.25 × 10^-27 J
Photon momentum is 5.44 × 10^-27 kg m s^-1. Recoil kinetic energy K = p^2/(2m). Using m = 1.6 × 10^-27 kg, K = (5.44 × 10^-27)^2 / (2 × 1.6 × 10^-27) = 9.25 × 10^-27 J.
+66 more questions available
Practice AllFrequently Asked Questions
What are the important topics in Photoelectric Effect for ICSE Class 12 Physics?
How to score full marks in Photoelectric Effect — ICSE Class 12 Physics?
How many important questions are there in Photoelectric Effect?
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
More resources for Photoelectric Effect
Practice Quiz
Test yourself with a quick quiz
Revision Notes
Key points for last-minute revision
Formula Sheet
All formulas in one place
Chapter Summary
Understand the chapter at a glance
Concept Maps
See how topics connect visually
Study Plan
Step-by-step plan to ace this chapter
Flashcards
Quick-fire cards for active recall
Syllabus
What topics to cover
NCERT Solutions
Every textbook question solved step by step
For serious students
Get the full Photoelectric Effect chapter — for free.
Quizzes, flashcards, AI doubt-solver and a step-by-step study plan for ICSE Class 12 Physics.