46. les ondes radio se déplacent à la vitesse de la lumière $3,00 \times 10^8\text{ m/s}$. si ta radio syntonise une station qui diffuse à $1\ 250\text{ khz}$, quelle est la longueur des ondes qui atteignent lantenne radio ?

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{ "quality": "clear", "question_count": 1, "skills_matched": [ "step_cot", "explain_then_answer", "quick" ], "needs_drawing": false, "concepts_used": [ "Scientific Notation" ], "new_concepts": [ "Wave Speed Formula", "Electromagnetic Waves" ], "current_concepts": [ "Scientific Notation", "Wave Speed Formula", "Electromagnetic Waves" ] } ## Convert the frequency to hertz $$ \begin{aligned} f &= 1250\text{ kHz} \ f &= 1250 \times 10^3\text{ Hz} \ f &= 1,25 \times 10^6\text{ Hz} \end{aligned} $$ ## Calculate the wavelength using the wave speed formula $$ \begin{aligned} v &= c = 3,00 \times 10^8\text{ m/s} \ \lambda &= \frac{v}{f} \ \lambda &= \frac{3,00 \times 10^8\text{ m/s}}{1,25 \times 10^6\text{ Hz}} \ \lambda &= 240\text{ m} \end{aligned} $$ $240\text{ m}$ { "subject": "Natural Science", "question_type": "Free Response", "knowledge_point": [ "Natural Science", "Physics", "Electromagnetic Waves" ] }

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Convert the frequency to hertz

Calculate the wavelength using the wave speed formula

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