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Orlov [11]
3 years ago
7

Volcanic eruptions are natural phenomena in the . They sometimes erupt, spilling out lava and dust. The lava solidifies, forming

new landmasses. Volcanoes can have an effect on the when plants and animals are threatened by an eruption. Volcanic ash and gas can also pollute the , resulting in acid rain and other unfavorable weather patterns.
Physics
1 answer:
solniwko [45]3 years ago
3 0

Answer:

B. Geosphere

A. Biosphere

A. Atmosphere

Explanation:

Volcanic eruptions occurs within the Geosphere. The geosphere is the rock solid earth make up of rocks that extends into the deep interior.

Magma formed deep within the crust rises to elevated parts and finally erupts as lava on the surface. When they cool, they solidify to form volcanic rocks.

The volcanic eruptions affects the biosphere significantly. The biosphere is the portion of the earth where all life forms exists.

Gases and ash spewed during an eruption into the atmosphere causes severe changes to weather and leads to pollution. The atmosphere is the gaseous envelope round the earth.

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As the people sing in church, the sound level everywhere inside is 101 dB . No sound is transmitted through the massive walls, b
katovenus [111]

The sound level from 1 km away is 46.4 dB and the sound energy radiated through the windows and doors in 20 min is 332.6 J

<h3>What do you mean by sound radiates?</h3>

Multiple plate modes participate in the forced vibration of a baffled plate that produces sound. The emitted sound power depends on the activation of each plate mode by the external pressures as well as the radiation characteristics of the individual plate modes and their mutual interaction via their radiated sound, as shown in eq (20) and (24). The net contribution of the mutual interaction between plate modes to the overall sound power may be disregarded if a plate is activated in a manner that results in a plate vibration field that can be defined as reverberant with an equal distribution of energy over all modes.

(Lw) = 10·log (W/Wo) dB

Given:

sound level,  \beta= 101 dB

Area, A = 22\;m^{2}

Time, \triangle t = 20\;min=1200\;s

Intensity, I=1\times 10^{-12}\;W/m^{2}

r=1\;km=1000\;m

(a)

We know that, Sound level is,

\beta=10\times log(\frac{I}{I_{o} } )

Solving the above equation for sound intensity,

I=I_{o} \times 10^{\frac{\beta}{10} }

I=1 \times 10^{-12}  \times 10^{\frac{101}{10} }

I=0.0126\;W/m^{2}

Therefore, The sound energy is,

E=P\times \triangle t

Substitute P=I \times A in the above equation,

E=I \times A \times \triangle t

E=0.0126 \times 22 \times 1200

E=332.6\;J

(b)

Half of a sphere area with 1 km radius is equal to Area of the sound at 1 km distance,

A_{hemisphere}  = \frac{1}{2} \times 4 r^{2} \pi

Substitute the known value in the above equation ,

A_{hemisphere} = \frac{1}{2} \times 4 (1000)^{2} \pi

A_{hemisphere} = 6283185\;m^{2}

Sound Intensity is,

I = \frac{P}{A_{hemisphere}}

Substitute P=I \times A in the above equation,

I = \frac{I \times A}{A_{hemisphere}}

Substitute the known value in the above equation,

I = \frac{0.0126 \times 22}{6283185}

I = 4.4 \times 10^{-8}\;W/m^{2}

Sound level is,

\beta=10\times log(\frac{I}{I_{o} } )

Substitute the known value in the above equation,

\beta=10\times log(\frac{4.4 \times 10^{-8} }{1 \times 10^{-12} } )

\beta=46.4\;dB

To learn more about sound radiates, Visit:

brainly.com/question/20360072

#SPJ4

8 0
2 years ago
Which type of image is formed by convex lens on a screen?​
Lina20 [59]

Answer:

The type of image formed on a screen by a convex lens is real, enlarged and inverted.

Explanation:

A lens can be defined as a transparent optical instrument that refracts rays of light to produce a real image.

Basically, there are two (2) main types of lens and these includes;

I. Diverging (concave) lens.

II. Converging (convex) lens.

A converging lens refers to a type of lens that typically causes parallel rays of light with respect to its principal axis to come to a focus (converge) and form a real image.

Basically, the type of image formed on a screen by a converging (convex) lens is real, enlarged and inverted because it is usually thick across the middle (causing rays of light to converge) but thin at the lower and upper edges.

5 0
3 years ago
Natalie accelerates her skateboard along a straight path from 4 m/s to 0 m/s in 25.0 s. Find the acceleration.
Lorico [155]
Its o.16 m/s2....really
7 0
3 years ago
What do you wish you had learned is Digital Citizenship class?
nydimaria [60]

Answer:

I wish I learned what I could do in the real world with the information I learned

Explanation:

7 0
3 years ago
When a solid uniform sphere is spinning about an axis of rotation through its center, its rotational kinetic energy is K and mom
lawyer [7]

Answer:

uh.

Explanation:

5 0
3 years ago
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