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Very Short Answer
🔥 APPEARED IN 3 BOARD SETS
The threshold frequency for a given metal is $3.6 \times 10^{14}$ Hz. If monochromatic radiations of frequency $6.8 \times 10^{14}$ Hz are incident on this metal, find the cut-off potential for the photoelectrons.
01 // VERIFIED BOARD OCCURRENCES
| Year | Paper Code | Set | Position |
|---|---|---|---|
| CBSE 2025 | Series 55-5 | Set 1 | Question 17 |
| CBSE 2025 | Series 55-5 | Set 2 | Question 21 |
| CBSE 2025 | Series 55-5 | Set 3 | Question 21 |
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)