Its D because of the emission spectra
Answer:
Atomic number of calcium is 20.
The total moment of inertia about an axis is :
for a ring of mass m and radius straight r attached to a thin rod.
<h3>
Determine the Total moment of Inertia about an axis </h3>
<u>Given data:</u>
mass of ring --> m
radius of ring --> r
mass of rod --> M
Length of rod ---> L ( 2 * radius )
Total Moment of Inertia about an axis = Irod + Iring
where : Irod = moment of inertia of rod, Iring = moment of inertia of ring
Irod = ML² / 3
Iring = 2mr² / 5
moment of inertia around an axis by Iring = I
where ; I = 2mr² / 5 + ML² according to parallel axis theorem
Hence the Total moment of Inertia about an axis is :
Itotal = 2mr²/5 + ML² + ML² / 3
= 
Learn more about Moment of inertia : brainly.com/question/6956628
Answer:
B
Explanation:
Sound waves are due to vibrations of the medium through which it passes through. The vibrations of the medium would occur more easily through a gas like the atmosphere
a = velocity change / time
I can't tell you that becouse I don't know time