Answer:
These are the chemical names and molecular formula of the compounds formed from these elements:
- Rubidium + Bromine = <em>Rubidium bromide, RbBr</em>
- Strontium + Sulphur = <em>Strontium sulfide, SrS</em>
- Barium and Chlorine = <em>Barium chloride, </em>
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Calculating the molar mass of naphthalene (C10H8)
molar mass = 10 x (12.01) + 8(1.008)
= 120.1 + 8.064 = 128.164 g/mol
This is the same as its freezing point
hope this helps
Answer : The intensity of sound level in decibels is, 169 dB
Explanation:
The expression used for the intensity of sound level is given by the equation:
where,
I = final intensity = 
= initial intensity = threshold intensity of human hearing = 
Now put all the given values in the above formula, we get:
Thus, the intensity of sound level in decibels is, 169 dB
Answer:
λ = 1.5 m
Explanation:
Given data:
Speed of wave = 1500 m/s
Frequency of sound = 1000 Hz
Wavelength of sound = ?
Solution:
Speed of wave = frequency × wavelength
by putting values,
1500 m/s = 1000 Hz × λ
λ = 1500 m/s / 1000 s⁻¹ (Hz = s⁻¹
)
λ = 1.5 m
