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`?

Options

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

Answer

D

Explanation

`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`.