Metal A has a threshold wavelength twice that of metal B

PHYSICS · Single correct · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

Problem

Metal A has a threshold wavelength twice that of metal B. What is the ratio

\dfrac{\phi_A}{\phi_B}

of their work functions? (a)

2:1

(b)

4:1

(c)

1:2

(d)

1:4