Sel darah merah mempunyai ukuran diameter 8 μm dan ketebalan 2 μm . Jika pada sebuah tempat berbentuk tabung dengan ukuran diameter 16 mm dan tinggi 32 mm dimasukkan sel darah merah, berapa banyak sel darah merah

<p>Jawab: 64×10⁹sel darah merah.</p><p>Pembahasan:</p><p>Ingat!</p><p>1 𝞵m = 1×10^-6 m.</p><p>1 mm = 1×10^-3mm.</p><p>Dengan menggunakan konsep di atas, diperoleh</p><p>Langkah 1. Menentukan volume sel darah merah.</p><p>d = 8 𝞵m</p><p>&nbsp; &nbsp; = 8×10^-3mm</p><p>r = 1/2×8×10^-3mm</p><p>&nbsp; &nbsp;= 4×10^-3mm</p><p>Ketebalan = 2 𝞵m</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; = 2×10^-3mm</p><p>Volume = 𝞹×r²×t</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 𝞹×(4×10^-3)²×2×10^-3&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 𝞹×4²×10^-6×2×10^-3&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 𝞹×16×10^-6×2×10^-3&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 𝞹×32×10^-9</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 32×10^-9𝞹 mm³</p><p>Langkah 2. Menentukan volume tabung.</p><p>d = 16 mm</p><p>r = 1/2×16</p><p>&nbsp; &nbsp;= 8 mm</p><p>t = 32 mm</p><p>Volume = &nbsp;𝞹×r²×t</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 𝞹×8²×32</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 𝞹×64×32</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 2048𝞹 mm³</p><p>Langkah 3. Menentukan banyak sel darah merah.</p><p>Banyak sel = Volume tabung/Volume sel&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 2048𝞹/32×10^-9𝞹</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 64×10⁹</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</p><p><strong><u>Jadi, jawaban yang benar adalah &nbsp;64×10</u>^{<u>9 </u>}<u>sel darah merah.</u></strong></p>