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3 years ago

The Mass number of an element is the?

Physics

2 answers:

stepan [7]3 years ago

4 0

Answer:

The mass number of an element is the number of protons plus neutrons.

Explanation:

The mass number of an element is the number of protons plus neutrons, so the correct answer is the option C.

Anon25 [30]3 years ago

4 0

The mass number of an element is the sum of the number of protons plus neutrons.

Answer: Option C

<u>Explanation:</u>

The element's mass number refers to the summative number of neutron and proton in the nucleus. In the nucleus there is the total number of protons and neutron, summed together to form the atomic mass.

Atomic mass is similar as the mass number in representation. Therefore, we have the following formula for the mass number,

Mass number of an element=Number of protons+Number of neutrons

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Answer:

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4 years ago

The intensity of the sound from a certain source is measured at two points along a line from the source. The points are separate

Artemon [7]

Answer:

The source is at a distance of 4.56 m from the first point.

Solution:

As per the question:

Separation distance between the points, d = 11.0 m

Sound level at the first point, L = 66.40 dB

Sound level at the second point, L'= 55.74 dB

Now,

$L = 10log_{10}\frac{I}{I_{o}}$

$I = I_{o}10^{\frac{L}{10}} = I_{o}10^{0.1L} = 10^{- 12}\times 10^{0.1\times 66.40} = 10^{- 5.36}$

$L' = 10log_{10}\frac{I'}{I_{o}}$

$I' = I_{o}10^{\frac{L'}{10}} = 10^{- 12}\times 10^{0.1\times 55.74} = 10^{- 6.426}$

where

$I_{o} = 10^{- 12} W/m^{2}$

I = Intensity of sound

Now,

$I = \frac{P}{4\pi R^{2}}$

Similarly,

$I' = \frac{P}{4\pi (R + 11.0)^{2}}$

Now,

$\frac{I}{I'} = \frac{(R + 11.0)^{2}}{R^{2}}$

$\frac{10^{- 5.36}}{10^{- 6.426}} = \frac{(R + 11.0)^{2}}{R^{2}}$

$R ^{2} + 22R + 121 = 11.64R^{2}}$

$10.64R ^{2} - 22R - 121 = 0$

Solving the above quadratic eqn, we get:

R = 4.56 m

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BlackZzzverrR [31]

Answer:

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Explanation:

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