Answer:
P waves travel faster than other waves
Explanation:
P waves travel fastest and are the first to arrive from the earthquake. In S or shear waves, rock oscillates perpendicular to the direction of wave propagation. In rock, S waves generally travel about 60% the speed of P waves, and the S wave always arrives after the P wave.
The smallest observable object for an electron microscope is 6.6nm.
<h3>Calculation of smallest observable object for an electron microscope :</h3>
Given,
Speed of electron (u) = 5.5 x 10⁴ m/s
De Broglie's formula,
wavelength, λ =h/mu
where,
h = Planck's constant = 6.626 x 
Js
m = mass of electron, 9.11 x 
kg
λ =h/mu
= 6.626 x Js /9.11 x kg x 5.5 x 10⁴ m/s
= 0.132 x 
m
= 13.2 x 
m
It is well known that the smallest thing that can be observed under any microscope is identical to the radiation's wavelength for the smallest object that can be seen under an electron microscope.
Therefore, 13.2 x m/2
= 6.6 x m
= 6.6 nm
Hence, the smallest observable object for an electron microscope is 6.6nm.
Learn more about electron microscope here:
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Answer is: empirical formula is Fe₂O₃.
m(Fe) = 7,50 g.
m(iron oxide) = 10,71 g.
n(Fe) = m(Fe) ÷ M(Fe).
n(Fe) = 7,50 g ÷ 55,85 g/mol = 0,134 mol.
m(O) = m(iron oxide) - m(Fe).
m(O) = 10,71 g - 7,50 g = 3,21 g.
n(O) = 3,21 g ÷ 16 g/mol = 0,20 mol.
n(Fe) : n(O) = 0,134 mol : 0,2 mol = 2 : 3.
Firstly, carbon isn't a metal.
Boron is a metalloid.
Beryllium is the least metallic alkaline earth metal, and lithium is the least metallic alkaline metal.
Both are metallic, and have metallic appearances and conduct electricity, but beryllium is more brittle than lithium.
So, I'd say Li and Be are equal.
