The amplitude of a sound wave is reduced from 2 mm to 1 mm. The intensity of the sound will: 1. become four times the initial 2. remain the same 3. become half of the initial 4. become one fourth of the initial

become one fourth of the initial Reason Given, - Initial amplitude = 2 mm - Final amplitude = 1 mm As, Intensity of a sound wave ∝ (Amplitude of vibrations)2 Then, So, Final intensity = x Initial intensity

Physics

The amplitude of a sound wave is reduced from 2 mm to 1 mm. The intensity of the sound will:
become four times the initial
remain the same
become half of the initial
become one fourth of the initial

Sound

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Answer

become one fourth of the initial

Reason —

Given,

Initial amplitude = 2 mm
Final amplitude = 1 mm

As,

Intensity of a sound wave ∝ (Amplitude of vibrations)²

Then,

$\dfrac{\text {Final intensity}}{\text {Initial intensity}} = \left({\dfrac{\text {Final amplitude}}{\text {Initial amplitude}}}\right)^2 = \left(\dfrac{1}{2}\right)^2 = \dfrac {1}{4}$

So,

Final intensity = $\dfrac {1}{4}$ x Initial intensity

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Physics

The amplitude of a sound wave is reduced from 2 mm to 1 mm. The intensity of the sound will:become four times the initialremain the samebecome half of the initialbecome one fourth of the initial

Sound

Answer

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An alloy constantan has resistivity 5 x 10-7 Ω m at 25°C. If the temperature of this alloy is increased to 50°C then its resistivity will be:2.5 x 10-7 Ω m5 x 10-7 Ω m10 x 10-6 Ω m20 x 10-6 Ω m

The amplitude of a sound wave is reduced from 2 mm to 1 mm. The intensity of the sound will:
become four times the initial
remain the same
become half of the initial
become one fourth of the initial

An object placed at a distance 30 cm in front of a lens produces clear inverted image at a distance 60 cm from the lens. If the object is placed at 60 cm from the lens, then it produces a clear inverted image at a distance of …………… from the lens.
20 cm
30 cm
60 cm
90 cm

An alloy constantan has resistivity 5 x 10^-7 Ω m at 25°C. If the temperature of this alloy is increased to 50°C then its resistivity will be:
2.5 x 10^-7 Ω m
5 x 10^-7 Ω m
10 x 10^-6 Ω m
20 x 10^-6 Ω m