White light consisting of wavelengths `380 nm le lambda le 750` nm is incident on a lead surface. For which one of the following ranges of wavelength

Question

White light consisting of wavelengths `380 nm le lambda le 750` nm is incident on a lead surface. For which one of the following ranges of wavelength

White light consisting of wavelengths `380 nm le lambda le 750` nm is incident on a lead surface. For which one of the following ranges of wavelength will photoelectrons be emitted from the elad surface that has a work funcation `W_(0) = 6.63 xx 10^(-29) J`?
A. `380` nm `le lambda le 750` nm
B. `380` nm `le lambda le 630` nm
C. `380` nm `le lambda le 540` nm
D. No photoelectrons will be emitted

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - D
`lambda_(max) = (hc)/(phi) rArr (6.63 xx 10^(-34)) (3 xx 10^(8))/((6.63 xx 10^(-19))`
`lambda_(max) = 300 nm`
Photons will be emitted for `lambda le 300 nm`.

4 views Answered 2023-02-05 15:29