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Butoxors [25]
3 years ago
5

Draw the model of an atom with an atomic number of 7 and a mass number of 15. How many valence electrons are in this atom.

Physics
1 answer:
o-na [289]3 years ago
7 0

Answer:

There are 5 valence electrons

Explanation:

Valence electrons are electrons found in the outermost shell of an atom.

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The sound level of one person talking at a certain distance from you is 61 dB. If she is joined by 5 more friends, and all of th
Lady_Fox [76]

Answer:

Explanation:

For sound level in decibel scale the relation is

dB = 10 log I / I₀ where I₀ = 10⁻¹² and I is intensity of sound whose decibel scale is to be calculated .

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61 = 10 log I / 10⁻¹²

log I / 10⁻¹² = 6.1

I = 10⁻¹² x 10⁶°¹

=10^{-5.9}

intensity of sound of 5 persons

I=5\times 10^{-5.9}

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4 0
3 years ago
Which of the following is a contact force?
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4 0
3 years ago
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In his explanation of the threshold frequency in the photoelectric field, Einstein reasoned that the absorbed photon must have t
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Answer:

4.6×10^-7 m or 0.46nm

Explanation:

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