Answer:
Explanation:
sound level scale is logarithmic which is given by the following formula
L = 10 log I / I₀ where I₀ = 10⁻¹² W / m² s
80 = 10 log I / 10⁻¹²
8 = log I / 10⁻¹²
I / 10⁻¹² = 10⁸
I = 10⁻⁴ W / m² .s
for three person the intensity becomes three times ie
3 x 10⁻⁴
L = 10 log 3 x 10⁻⁴ / 10⁻¹²
= 10 log 3 x 10⁸
= 10 ( 8 + log 3 )
= 10 ( 8 + .477 )
= 84.77 dB .
Electron groups could be considered as Lone pair electrons and bonded pairs of electrons.
Answer: Option D & B
<u>Explanation:</u>
The two or more electrons can be bonded by single bond, double bond, covalent bond of electrons can simply be lone pair of electrons. Unshared pair of electrons are generally termed as lone pair of electrons in an atom which are generally present in the outermost shell of atoms. Hence electron groups can be determined by bonded pairs and lone pairs of electrons.
Answer:
C
Explanation:
Sound waves speed up noticeably when moving through a solid or liquid, because all it is is just particles colliding; and particles are way closer together with those states of matter.
The speed of light can change when moving through different substances, but this is dependent on complicated factors such as frequency, polarization, intensity, et. cetera
The important part is that it does change speed, so your answer is C.
Hope this helps!
<span>Approximately 30% of the Sun's energy is currently reflected by Earth's atmosphere</span>
