| ENEM 2024 | Q99 - UMA AMBULÂNCIA EM ALTA VELOCIDADE COM A SIRENE LIGADA DESLOCA-SE EM DIREÇÃO A UM

I am Felipe Filatte, a teacher and pedagogical coordinator, specializing in ENEM and university entrance exams. Here you will find commented solutions, focused on understanding the reasoning and gaining confidence in the exam. 🎁 FREE GIFT FOR THOSE PREPARING FOR THE ENEM EXAM ENEM TRI Calculator Spreadsheet https://docs.google.com/spreadsheets/... 📂 LINK TO THE DRIVE WITH THE EXAMS https://drive.google.com/drive/folder... MOTIVATIONAL TEXT An ambulance traveling at high speed with its siren on is heading towards a radar operated by a person. The radar emits radio waves with frequency f₀ which are reflected by the front of the ambulance, returning to the detector with frequency fr. The radar operator's perception of the siren's sound is that it changes as the ambulance approaches or moves away. STATEMENT During the approach, how does the operator perceive the siren's sound, and what is the relationship between the frequencies fr and f₀ measured by the radar? A) Lower pitch than the emitted sound and fr LESS THAN f₀. B) Higher pitch than the emitted sound and fr LESS THAN f₀. C) Higher pitch than the emitted sound and fr = f₀. D) Higher pitch than the emitted sound and fr GREATER THAN f₀. E) Lower pitch than the emitted sound and fr GREATER THAN f₀. Answer Key ✅ Option D #enem #enem2024 #commentedquestions #physics #wavemotion #dopplereffect #waves #frequency #radar #entranceexams #medicine #professorfilatte #tri