Science 02
বিবি ফুি ক াস স সাধারণ বিজ্ঞান । ❑ ❑
𝟏 ,𝐟 = , ,𝐓 = 𝐓
𝐬−𝟏
(𝝀) । 𝒗 𝐦𝐬 −𝟏 । 𝒗 = 𝒇𝝀 𝒗= 𝒇 𝝀= ❑ । 𝟏 ∝ 𝒍
𝟏 ∝ 𝑻 𝒍 ∝ 𝒍 𝒎 ❑ ❑ 𝐦𝐬 −𝟏
❖ ➢
𝑚𝑠 −1
𝜆 ❑ 𝟐𝟎𝐇𝐳 𝟐𝟎, 𝟎𝟎𝟎𝐇𝐳 । ।
❑ 𝟐𝟎𝐇𝐳 । ।
❑ । । । । ❑ ➢
। ➢
➢ চিত্র: প্রচিধ্বচির সাহায্যে পাচির গভীরিা চির্ণয় ❑ ➢ ➢ ➢ ➢ ➢ ➢ ➢ ➢ ❑ ➢ ❑ 10−4 m 5 × 104 m
10−1 m 10−3 m
10−3 m 4 × 10−7 m
7 × 10−7 m 4 × 10−7 m
5 × 10−7 m 5 × 10−9 m
5 × 10−8 m 5 × 10−15 m5 × 10−11 m 15 × 10−15 m । ❑ ❑
❑ ➢ ❑▪ ।▪ । । ।▪ ।
। ।▪ ।▪ । ❑ ❑ ▪
▪ ✓
✓ । ❑
চিত্র: আল োর প্রচিসরণ❑▪▪▪▪ ❑
n1 n2 θ1 θ2 n1 sinθ1 = n2 sinθ2 sinθ1 n1 n2 = sinθ2 ❑
৯০° 𝛉𝐜 ❑
❑▪▪
❑▪▪▪▪▪ । ❑
▪ । ।▪ ।▪ । ❑✓
▪▪ চিত্র: উত্তল ললন্স
▪▪ ❑ ❑ ➢ ❑
❑ ❑
➢➢ ❑
। । । । 10−8 𝑚 10−13 ।
। ❑ ➢ । ➢ । ➢ । ➢ । ➢ । । ➢ । ➢ । ➢ । ➢ । ❑ ➢ ❖
❖ ❖
❖ https://www.facebook.com/uttoronacademy https://www.facebook.com/groups/www.uttoron.academy https://www.youtube.com/c/Uttoron
