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A ray of yellow light has a wavelength of about 5.8×10−7 m. Will exposure to yellow light cause electrons to be emitted from cesium?

Verified Answer :

syed514

the wavelength of the red light = 700 nm
f = c/w
c =  2.998 108 meters per second. 

f = (2.998 10*8) / (7.0 10*-7) = 4.283 10*14 cycles per sec. 

Since the threshold frequency of Cs is 9.39 10**14 Hz, the red light doesn't 
have a high enough frequency (or energy) to cause electron emission. 

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