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in Physics by (122k points)
यदि धातु का कार्य फलन `(hc)/(lambda_(0))` हो तथा आपतित प्रकाश की तरंग दैर्ध्य `lambda` हो तो प्रकाश विधुत उत्सर्जन की लिए सार्थ है
A. `lambda ge lambda_(0)`
B. `lambda ge 2 lambda_(0)`
C. `lambda le lambda_(0)`
D. `lambda le lambda_(0) // 2`

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