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in Physics by (122k points)
पराबैंगनी किरणे जिनकी ऊर्जा `6*2eV` है, एल्युमिनयम की सत्य पर ( कार्यालयं `4*2eV` ) गिरती है सबसे तेज इलेक्ट्रॉन की गतिज ऊर्जा जूल में लगभव कितनी होगी ---
A. `3 xx 10^(-21)`
B. `3*2 xx 10^(-19)`
C. `4 xx 10^(-17)`
D. `3xx 10^(-15)`

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