A. sulfur dioxide ...................................................
Protons are one of the fully stable parts of matter
If an emergency vehicle passes you in traffic, just as it passes you the pitch of the siren changes as it approaches, the siren’s pitch sounds higher than when it is moving away from you.the frequency increases as the siren is moving toward you, and decreases as it is moving away, is correct
This change is a common physical demonstration of the Doppler effect.
<h3>What is Doppler effect ?</h3>
This effect refers to the increase in the frequency of sound, as the source and observer move toward (or away from) each other.
The effect causes the sudden change in pitch noticeable in a passing siren.
Hence Option (B) i.e, the frequency increases as the siren is moving toward you, and decreases as it is moving away, is correct
Learn more about Doppler' effect here ;
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Answer:
x
Explanation:
becaue neutron equal to mass num -atomic num
Answer:
3.98 mol
Solution:
Moles and mass is related to each other as follow,
Moles = Mass / M.mass ------ (1)
Data Given:
Mole = ?
Mass = 80 g
M.mass = 20.07 g/mol ∴ (H = 1.08 g/mol) + (F = 18.99 g/mol)
Putting values in equation 1,
Mole = 80 g ÷ 20.07 g.mol⁻¹
Mole = 3.98 mol
