यह साइट खासकर के प्रैक्टिस के लिए है, इसलिए अधिकतर प्रश्नो के उत्तर नहीं दिए गए हैं| आप उत्तर देके मदद कर सकते हैं अपनी और दूसरों की भी

What is a comparison of two different quantities that are changing?What is the difference between (क्या अंतर है ) a spectrophotometer and a photometer?

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