Ix bob. Akustika 65 §. Akustika

9.1 - masala. Yuqori sifatli radiopriyomnik karnayi chastotalari 30 - 18000Hz kenglikda, balandligi maksimal darajada bo‘lgan tovushlarni chiqaradi. Tovush balandligi darajasi 3dBga o‘zgarganda tovush jadalligi necha marta o‘zgaradi?

Yechim. O‘rtacha jadallikni I₁ va o‘rtacha tovush balandligini esa β₁ bilan belgilaymiz. Bu holda I₂ maksimal jadallik β₂ = β₁ + 3dB tovush balandligiga mos keladi. Shunday qilib,
β₂ - β₁ = 10lg(I₂I₀) – 10lg(I₁/I₀),
3dB = 10[lg(I₂/I₀) – lg(I₁/I₀)] = 10lg(I₂/I₁),
10lg(I₂/I₁) = 0,30.
Natural logarifm jadvali orqali quyidagiga ega bo‘lamiz I₂/I₁ = 0,20, yoki I₂ jadallik I₁ ga nisbatan ikki marta katta bo‘ladi[1].

Mavzuni o‘zlashtirish uchun tavsiya etiladigan pedagogik dasturiy vositalar

	Resurs nomi	Tasnifi
	https://phet.colorado.edu/en/simulation/legacy/wave-interference	Topics Waves Sound Description Make waves with a dripping faucet, audio speaker, or laser! Add a second source or a pair of slits to create an interference pattern.
	https://phet.colorado.edu/en/simulation/legacy/sound	Topics Sound Waves Description This simulation lets you see sound waves. Adjust the frequency or volume and you can see and hear how the wave changes. Move the listener around and hear what she hears.

Nazorat savollari
1. Tovushning kuchi, balandligi va tembrini tavsiflab bering.

2. Tovush jadalligi nima?

3. Tovushli linzalar va oynalar qaysi maqsadlarda ishlatiladi?

4. Ultratovushlarni har xil muhitlarda tarqalishi va yutilishini tushuntirib bering.