Three photo diodes `D_1`, `D_2` and `D_3` are made of semiconductors having band gaps of 2.5 eV, 2eV and 3eV, respectively. Which ones will be able to detect light of wavelength `6000 oversetcircA`?

Two metal A and B have work functions, 2eV and 5eV respectively. Which metal has lower threshold wavelength?

Two metals X and Y have work functions 2eV and 5eV respectively. Which metal will emit electrons, when irradiated with light of wavelength 400m, and why?

Two metals X and Y have work functions 2eV and 5eV respectively. Which metal will emit electrons when it is irradiated with light of wavelenth 400 nm and why?

A p-n photodiode is fabricated from a semiconductor with band gap of 2.8 eV. Can it detect a wavelength of 6000 nm?

The work function for the following metals is given Na: 2.75V, K:2.30eV, Mo:4.17eV, Ni:5.15eV Which of these metals will not give photoelectron emission fro a radiation of wavelength 3300 oversetcircA from a He-Cl laser placed 1 m away from the photocell?

Which of the drawings (a) to (d) show: 3xx2/3