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♌Giải sách bài tập Khoa học tự nhiên 7 - Kết nối tri thức, SBT KHTN 7 - KNTT

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Bài 12. Sóng âm
Giải thích âm từ một dây đàn ghi ta được gảy truyền đến tai ta như thế nào? ෴ Xem lời giải
Bài 13. Độ to và độ cao của âm
Một vât dao động phát ra âm có tần số 50Hz và một vật khác phát ra âm dao động có tần số 90Hz. Vật nào dao động nhanh hơn? Vật nào phát ra âm thấp hơn? 🍸 Xem lời giải

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Bài 14. Phản xạ âm, chống ô nhiễm tiếng ồn
Thế nào là âm phản xạ? Âm phản xạ có lợi hay có hại? Nêu ví dụ. ⛎ Xem lời giải

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Bài 12. Sóng âm

Bài 13. Độ to và độ cao của âm

Bài 14. Phản xạ âm, chống ô nhiễm tiếng ồn