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Physics
Physics
Problem
Metal A has a threshold wavelength twice that of metal B. What is the ratio
ϕ
A
ϕ
B
\dfrac{\phi_A}{\phi_B}
ϕ
B
ϕ
A
of their work functions? a)
2
:
1
2:1
2
:
1
b)
4
:
1
4:1
4
:
1
c)
1
:
2
1:2
1
:
2
d)
1
:
4
1:4
1
:
4
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