12:["$","span","2",{"dangerouslySetInnerHTML":{"__html":" Hz"},"className":"whitespace-pre-wrap"}] 19:T469,

9 \times 10^{18}

13:["$","div","b",{"className":"p-4 border-2 border-gray-100 rounded-2xl hover:bg-blue-50 hover:border-blue-200 flex items-center gap-4 cursor-pointer group transition-all duration-300","children":[["$","span",null,{"className":"w-8 h-8 shrink-0 rounded-full bg-gray-100 text-gray-600 flex items-center justify-center font-bold uppercase group-hover:bg-blue-600 group-hover:text-white transition-colors shadow-sm","children":"b"}],["$","div",null,{"className":"text-gray-700 font-medium text-base md:text-lg","children":["$","span",null,{"className":"leading-loose text-gray-800 font-sans","children":[["$","span","0",{"dangerouslySetInnerHTML":{"__html":""},"className":"whitespace-pre-wrap"}],["$","span","1",{"dangerouslySetInnerHTML":{"__html":"$19"},"className":"mx-1"}],["$","span","2",{"dangerouslySetInnerHTML":{"__html":" Hz"},"className":"whitespace-pre-wrap"}]]}]}]]}] 1a:T46c,

16 \times 10^{18}

14:["$","div","c",{"className":"p-4 border-2 border-gray-100 rounded-2xl hover:bg-blue-50 hover:border-blue-200 flex items-center gap-4 cursor-pointer group transition-all duration-300","children":[["$","span",null,{"className":"w-8 h-8 shrink-0 rounded-full bg-gray-100 text-gray-600 flex items-center justify-center font-bold uppercase group-hover:bg-blue-600 group-hover:text-white transition-colors shadow-sm","children":"c"}],["$","div",null,{"className":"text-gray-700 font-medium text-base md:text-lg","children":["$","span",null,{"className":"leading-loose text-gray-800 font-sans","children":[["$","span","0",{"dangerouslySetInnerHTML":{"__html":""},"className":"whitespace-pre-wrap"}],["$","span","1",{"dangerouslySetInnerHTML":{"__html":"$1a"},"className":"mx-1"}],["$","span","2",{"dangerouslySetInnerHTML":{"__html":" Hz"},"cla

Q.The frequency of Kα X-ray line for an element of atomic number 42 is found to be 3 × 10¹⁸ Hz. For atomic number 82, the frequency is nearly

Correct Answer: Option A

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