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Radhika Batra Grade: 11
`         When 40 kV is applied across an X-ray tube, X-ray is obtained with a maximum frequency of 9.7 × 10^18 Hz. Calculate the value of Planck constant from these data. `
3 years ago

## Answers : (1)

Kevin Nash
askIITians Faculty
332 Points
```										 λ = hc/eV ; V = 40 kV, f = 9.7 * 10^18 Hz
Or, h/c = h/eV ; or, i/f = h/eV ; or h = eV/f V – s
= eV/f V –s = 40* 10^3/9.7* 10^18 = 4.12 * 10^15 eV-s.

```
3 years ago
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