What Is the Minimum Frequency of a Photon That Can $\varPhi$

question 28

Multiple Choice

What is the minimum frequency of a photon that can eject a photoelectron from Ba metal? (The work function of barium is $\varPhi$ = 4.3 *10^-19 J.)

• A)2.8* 10^-52 Hz
• B)6.5 *10¹⁴ Hz
• C)6.5 * 10⁴ Hz
• D)6.5*10¹³ Hz
• E)2.8 * 10¹⁴ Hz

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