Ask Questions, Get Answers

Want to ask us a question? Click here
Browse Questions
0 votes

Threshold wavelength for photoelectric emission from a metal surface is 5200 $A^{\circ}$ will be emitted when this surface is illuminated with monochromatic radiation from . Photoelectrons

$\begin {array} {1 1} (a)\;1W\: IR\: lamp & \quad (b)\;50\: W\: UV\: lamp \\ (c)\;50\: W \: IR \: lamp & \quad (d)\;10 \: W\: IR\: lamp \end {array}$


Can you answer this question?

1 Answer

0 votes
Ans : (b)
For photoelectric emission to take place the wavelength of incident
light must be less than
threshold value which is 5200 $A^{\circ}$
wavelength of IR light = 7800 $A^{\circ}$
wavelength of UV light = 4000 $A^{\circ}$


answered Dec 31, 2013 by thanvigandhi_1
edited Mar 13, 2014 by thanvigandhi_1

Related questions

Ask Question
student study plans
JEE MAIN, CBSE, AIPMT Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App