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बिस्मथ धातु का कार्य फलन 2.5eV है । यदि प्रत्येक 1.5eV ऊर्जा वाले दो फोटॉन बिस्मथ पर एक साथ आपतित हों , तो क्या वे फोटो - इलेक्ट्रॉन उत्सर्जित कर सकें

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बिस्मथ धातु का कार्य फलन 2.5eV है । यदि प्रत्येक 1.5eV ऊर्जा वाले दो फोटॉन बिस्मथ पर एक साथ आपतित हों , तो क्या वे फोटो - इलेक्ट्रॉन उत्सर्जित कर सकेंगे ? समझाइए ।
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नहीं, क्योंकि एक फोटॉन ही इलेक्ट्रॉन उत्सर्जित करता है । अतः एक फोटॉन की ऊर्जा कार्य फलन से अधिक होनी चाहिए ।
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