CAIE A-Level Physics A2 22.2.2 The Terms Threshold Frequency and Threshold Wavelength

[Maximum number: 3]

(a)

Light of a single wavelength is incident on the surface of different metals. The work function energy of the metals is given in Table 7.1.

Table 7.1

[ 3 ]

(i)

Explain the term threshold wavelength.

[ 1 ]

(ii)

For the metals in Table 7.1, calculate the value of the largest threshold wavelength.
threshold wavelength = m

[ 2 ]

$\text { work function }=2.26 \times 1.60 \times 10^{-19}(\mathrm{~J})$ $E=h c / \lambda$ so
$\left(2.26 \times 1.60 \times 10^{-19}\right)=\left(6.63 \times 10^{-34} \times 3.00 \times 10^{8}\right) / \lambda_{0}$ $\lambda_{0}=5.50 \times 10^{-7} \mathrm{~m}$

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CAIE A-Level Physics A2 22.2.2 The Terms Threshold Frequency and Threshold Wavelength Topic Practice

Question 1

Question (a)

Question (i)

Question (ii)