The threshold frequencies of four metals A, B, C and D are ,

PHYSICS · Multi-part · A Level · Physics · Particles and radiation · Particles and radiation

Problem

The threshold frequencies of four metals A, B, C and D are 4.0×1014 Hz4.0\times10^{14}\,\text{Hz}, 5.5×1014 Hz5.5\times10^{14}\,\text{Hz}, 3.2×1014 Hz3.2\times10^{14}\,\text{Hz} and 6.0×1014 Hz6.0\times10^{14}\,\text{Hz} respectively. (i) Arrange the metals in increasing order of their work functions. (ii) Which metal will emit photoelectrons most readily when illuminated by light of frequency 7.0×1014 Hz7.0\times10^{14}\,\text{Hz}?

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