alleryThreshold frequency ν₀ for photoemission:
Ahν₀ = φ (energy just overcomes work function, KE = 0)
Bν₀ = 0
CNo threshold
Dν₀ = c
Answer & Solution
Correct answer: A. hν₀ = φ (energy just overcomes work function, KE = 0)
ν₀ = φ/h.
Below ν₀: no emission regardless of intensity.
At ν₀: emission starts with zero KE.
Above ν₀: KE = h(ν - ν₀).
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