21:["$","div",null,{"className":"px-6 pb-6","children":[false,["$","div",null,{"className":"text-foreground leading-relaxed mb-6","children":["$","div",null,{"className":"question-html prose dark:prose-invert max-w-none","dangerouslySetInnerHTML":{"__html":"

Radar waves of wavelength 0.05 m reflect from an aeroplane and give a\nbeat of 1200 Hz with the source. Find the approach speed. (answer in $m/s$ ).

"}}]}],false,["$","div",null,{"className":"mt-8 flex flex-col gap-4","children":[["$","details",null,{"className":"group","children":[["$","summary",null,{"className":"flex items-center gap-2 cursor-pointer list-none text-sm select-none","children":[["$","div",null,{"className":"w-6 h-6 flex items-center justify-center rounded hover:bg-green-50 dark:hover:bg-green-950/30 text-green-600 dark:text-green-400 transition-colors","children":["$","svg",null,{"ref":"$undefined","xmlns":"http://www.w3.org/2000/svg","width":24,"height":24,"viewBox":"0 0 24 24","fill":"none","stroke":"currentColor","strokeWidth":2,"strokeLinecap":"round","strokeLinejoin":"round","className":"lucide lucide-chevron-right w-4 h-4 group-open:rotate-90 transition-transform","children":[["$","path","mthhwq",{"d":"m9 18 6-6-6-6"}],"$undefined"]}]}],["$","span",null,{"className":"font-medium text-green-600 dark:text-green-400","children":"Answer:"}]]}],["$","div",null,{"className":"mt-2 ml-8 font-semibold text-green-700 dark:text-green-400 text-sm","children":"30"}]]}],["$","details",null,{"className":"group","children":[["$","summary",null,{"className":"flex items-center gap-2 cursor-pointer list-none text-sm select-none","children":[["$","div",null,{"className":"w-6 h-6 flex items-center justify-center rounded hover:bg-blue-50 dark:hover:bg-blue-950/30 text-blue-600 dark:text-blue-400 transition-colors","children":["$","svg",null,{"ref":"$undefined","xmlns":"http://www.w3.org/2000/svg","width":24,"height":24,"viewBox":"0 0 24 24","fill":"none","stroke":"currentColor","strokeWidth":2,"strokeLinecap":"round","strokeLinejoin":"round","className":"lucide lucide-chevron-right w-4 h-4 group-open:rotate-90 transition-transform","children":[["$","path","mthhwq",{"d":"m9 18 6-6-6-6"}],"$undefined"]}]}],["$","span",null,{"className":"font-medium text-blue-600 dark:text-blue-400","children":"Solution:"}]]}],["$","div",null,{"className":"mt-3 ml-8 p-4 bg-blue-50/50 dark:bg-blue-950/20 rounded-lg text-foreground border border-blue-100/50 dark:border-blue-900/40","children":["$","div",null,{"className":"question-html prose-sm dark:prose-invert max-w-none","dangerouslySetInnerHTML":{"__html":"$26"}}]}]]}]]}]]}]

Physics - Sound Wave Question with Solution | TestHub

Doubts & Discussion