First slide

Photo electric effect

Question

Threshold frequency for platinum is 1.3 $\times$ 10¹⁵ sec^-1. Platinum shows photo electric effect when exposed to

Moderate

A

Infrared light only
B

Ultraviolet light only
C

Both U. V light and Infra red light
D

Neither U.V nor Infrared light

Solution

Threshold frequency of platinum falls in the U V range ( 8 $\times$ 10¹⁴ s^-1- 3 $\times$ 10¹⁶ s^-1). Platinum display the photo electric effect when exposed to
U V light pt frequency $⩾$ 1.3 $\times$ 10¹⁵ s^-1
Frequency of I R light is in the range of 10¹² s^-1 - 4 $\times$ 10¹⁴ s^-1lesser the threshold frequency of platinum, will not show photo electric effect.

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