آموزش فیزیک دبیرستان: مهندس سعید نمازی | United States America (US)

Create: 2025-06-30 Update: 2025-07-06 09:02:47

#سوال: چرا آسمان آبی است؟
پاسخ:
1. نور خورشید سفید است، اما از رنگ‌های گوناگون (قرمز، نارنجی، زرد، سبز، آبی، نیلی، بنفش) تشکیل شده.
2. وقتی نور خورشید وارد جو زمین می‌شود، با مولکول‌های هوا و ذرات ریز برخورد می‌کند.

3. این برخورد باعث پراکندگی نور (پدیده‌ی ریلی - Rayleigh Scattering) می‌شود.

4. در این پراکندگی، نورهای با طول‌موج کوتاه‌تر (مثل آبی و بنفش) بیشتر پراکنده می‌شوند نسبت به نورهای با طول‌موج بلندتر (مثل قرمز).

5. نور بنفش از آبی هم بیشتر پراکنده می‌شود، اما چشم انسان به رنگ آبی حساس‌تر است و بیشتر آن را می‌بیند.
6. به همین دلیل، وقتی در طول روز به آسمان نگاه می‌کنیم، آن را آبی می‌بینیم.

✅ نکته جالب:
در غروب و طلوع، نور آبی مسیر طولانی‌تری در جو طی می‌کند و بیشتر پراکنده می‌شود، در نتیجه نور قرمز و نارنجی غالب می‌شود و آسمان سرخ دیده می‌شود.

@physics_school

آموزش فیزیک دبیرستان: مهندس سعید نمازی

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آموزش فیزیک دبیرستان: مهندس سعید نمازی

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Should I buy bitcoin?

“To the extent it is used I fear it’s often for illicit finance. It’s an extremely inefficient way of conducting transactions, and the amount of energy that’s consumed in processing those transactions is staggering,” the former Fed chairwoman said. Yellen’s comments have been cited as a reason for bitcoin’s recent losses. However, Yellen’s assessment of bitcoin as a inefficient medium of exchange is an important point and one that has already been raised in the past by bitcoin bulls. Using a volatile asset in exchange for goods and services makes little sense if the asset can tumble 10% in a day, or surge 80% over the course of a two months as bitcoin has done in 2021, critics argue. To put a finer point on it, over the past 12 months bitcoin has registered 8 corrections, defined as a decline from a recent peak of at least 10% but not more than 20%, and two bear markets, which are defined as falls of 20% or more, according to Dow Jones Market Data.

#سوال: چرا آسمان آبی است؟

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