Question:
તરંગલંબાઈ \( \lambda \)વાળા પ્રકાશનું કિરણ ત્રણ ફોટોઇલેક્ટ્રિક સેલ પર પડે છે. જો \( \lambda_1 \le \lambda \), \( \lambda_2 \gt \lambda \), \( \lambda_3 \gg \lambda \) હોય તો સ્ટોપિંગ પોટેન્શિયલ \( V_1, V_2, V_3 \) માટે સાચો વિકલ્પ છે:
તરંગલંબાઈ \( \lambda \)વાળા પ્રકાશનું કિરણ ત્રણ ફોટોઇલેક્ટ્રિક સેલ પર પડે છે. જો \( \lambda_1 \le \lambda \), \( \lambda_2 \gt \lambda \), \( \lambda_3 \gg \lambda \) હોય તો સ્ટોપિંગ પોટેન્શિયલ \( V_1, V_2, V_3 \) માટે સાચો વિકલ્પ છે:
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જો આપાત પ્રકાશની તરંગલંબાઈ થ્રેશોલ્ડ તરંગલંબાઈ કરતા વધારે હોય, તો કોઈ પણ ફોટોઇલેક્ટ્રોન ઉત્સર્જિત થશે નહીં!
Updated On: Jun 23, 2026
- \( V_1 \lt V_2 \), \( V_3 = 0 \)
- \( V_1 = 0 \), \( V_2 \lt V_3 \)
- \( V_1 \gt 0 \), \( V_2 = 0 \), \( V_3 = 0 \)
- \( V_1 \gt V_2 \), \( V_3 = 0 \)
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
ફોટોઇલેક્ટ્રિક અસર ત્યારે જ થાય છે જ્યારે \( \lambda \le \lambda_0 \). સ્ટોપિંગ પોટેન્શિયલ \( eV_s = hc(\frac{1}{\lambda} - \frac{1}{\lambda_0}) \).
Step 2: Detailed Explanation:
- સેલ 1: \( \lambda_1 \le \lambda \), એટલે ફોટોઇલેક્ટ્રિક ઉત્સર્જન થશે અને \( V_1 \gt 0 \).
- સેલ 2: \( \lambda_2 \gt \lambda \), ઉત્સર્જન નહીં થાય, \( V_2 = 0 \).
- સેલ 3: \( \lambda_3 \gg \lambda \), ઉત્સર્જન નહીં થાય, \( V_3 = 0 \).
Step 3: Final Answer:
આમ, \( V_1 \gt 0 \), \( V_2 = 0 \), \( V_3 = 0 \) સાચું છે.
ફોટોઇલેક્ટ્રિક અસર ત્યારે જ થાય છે જ્યારે \( \lambda \le \lambda_0 \). સ્ટોપિંગ પોટેન્શિયલ \( eV_s = hc(\frac{1}{\lambda} - \frac{1}{\lambda_0}) \).
Step 2: Detailed Explanation:
- સેલ 1: \( \lambda_1 \le \lambda \), એટલે ફોટોઇલેક્ટ્રિક ઉત્સર્જન થશે અને \( V_1 \gt 0 \).
- સેલ 2: \( \lambda_2 \gt \lambda \), ઉત્સર્જન નહીં થાય, \( V_2 = 0 \).
- સેલ 3: \( \lambda_3 \gg \lambda \), ઉત્સર્જન નહીં થાય, \( V_3 = 0 \).
Step 3: Final Answer:
આમ, \( V_1 \gt 0 \), \( V_2 = 0 \), \( V_3 = 0 \) સાચું છે.
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