Answer:
Density
Explanation:
Waves are periodic disturbances that travel in a medium by carrying energy without carrying matter.
There are two types of waves:
- Mechanical waves: these are produced by the vibrations of the particles in a medium. An example of mechanical waves are sound waves. Mechanical waves can only propagate through a medium, while they cannot travel in a vacuum.
- Electromagnetic waves: these consist of the oscillations of electric and magnetic fields in a direction perpendicular to the propagation of the wave. These are the only type of waves that can travel in a vacuum, since they do not need a medium.
The speed of a wave is the speed at which the wave propagates through the medium / the vacuum.
For mechanical waves, the speed of a wave in a solid material is given by
where
B is the bulk modulus of the medium
is the density of the medium
Therefore, from the formula we see that the wave speed depends on the density of the medium, while the other quantities (volume, electric charge) are not involved.
For liquids and gases, the wave speed is obtained through a different formula, however it still depends on the density of the material. So the correct answer is
a) Density
Answer:
Energy moves from one place to another through the wave. answer A
Answer:
2.11 m
Explanation:
<u>Given data</u>
h=6.626×(plank constant)
L=45.7 pm
n=n2-n1
n=5-1
n=4
<em>where,</em>
<em>n2=5</em>
<em>n1=1</em>
<u>To find:</u>
E=?
λ=? (Wavelength)
<u>solution</u>
The energy stored in an electron at a specified level is given by;
E=×÷8m..........(1)
<em>m=mass of electron(9.1×</em>)
<em>l=length of box</em>
<u>To find E</u>
putting the value of given data in eq(1)
E=9.41×
<u>To find λ</u>
λ=hc/E............................(2)
c=3×(speed of light)
putting the value in eq 2 to find wavelength
λ=2.11 m
<u></u>
<u>Note:</u>
There is a chance in calculation error. but the method is correct to solve the problem.