✓ 4 MARKS
Case Study
🔥 APPEARED IN 3 BOARD SETS
A researcher performs an experiment on photo-electric effect using two metals A and B with unknown work functions. She illuminates the surfaces of A and B with monochromatic radiation of various frequencies and records the value of corresponding stopping potentials ($V_s$). The graph shows the variation of stopping potential ($V_s$) with the frequency of incident radiation ($\nu$) for metals A and B.
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2026 | Series 55-1 | Set 1 | Question 30 |
| CBSE 2026 | Series 55-1 | Set 2 | Question 29 |
| CBSE 2026 | Series 55-1 | Set 3 | Question 30 |
02 // OFFICIAL CBSE MARKING SCHEME BREAKDOWN
- Step 1: Stating the fundamental formula / law statement (+1 Mark)
- Step 2: Intermediate mathematical substitution or proof steps (+1 Mark)
- Step 3: Correct final value or conclusion with mandatory SI units (+1 Mark)