A light detector based on the photoelectric effect is made with cesium metal.?

0 ⤊

A light detector based on the photoelectric effect is made with cesium metal.?

A light detector based on the photoelectric effect is made with cesium metal. Cesium metal has a work function of 3.4 times 10 raised to the -19th J. What is the longest wavelength of light that one could expect to detect with this device?

a) 850 nm
b) 580 nm
c)1700 km
d) 7100 km
e 420 nm

Please show appropriate work. Thanks.

2006-12-21 08:41:49 · 2 answers · asked by Anitec 2 in Science & Mathematics ➔ Chemistry

And no, this not homework. I'm reviewing for a final tomorrow and this is a particular question I need help in. Thanks for you for putting the *** in assumption.

2006-12-21 08:47:52 · update #1

2 answers

The threshold wavelength for Cs is 650 nm. So the longest wavelength is b) 580nm.

2006-12-21 08:57:28 · answer #1 · answered by Peter B 3 · 0⤊ 0⤋

Useless info to me. Do your own d*** homework.

2006-12-21 16:44:27 · answer #2 · answered by Anonymous · 0⤊ 0⤋