Answer:
Fluorine is the 9th element of the periodic table. If its Neutral... It'll have an atomic mass of 19. Also Since its neutral... Number of protons and Electrons will be the same which is 9. Now the Neutron number is the Mass number - The atomic no = 19-9 = 10Neutrons
Answer:
23.99N
Explanation:
Given:
Pressure created by the heart = 120mm of hg
converting the pressure into the standard unit of N/m²
1mm of hg = ![\frac{1}{760}atm=\frac{1}{760}\times 1.013\times10^5N/m^2](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B760%7Datm%3D%5Cfrac%7B1%7D%7B760%7D%5Ctimes%201.013%5Ctimes10%5E5N%2Fm%5E2)
now, 120 mm of hg in N/m² will be
120mm of hg = ![\frac{12}{760}\times 1.013\times10^5N/m^2](https://tex.z-dn.net/?f=%5Cfrac%7B12%7D%7B760%7D%5Ctimes%201.013%5Ctimes10%5E5N%2Fm%5E2)
also
given effective area = 15.0 cm² = 15 × 10⁻⁴m²
Now,
Force = Pressure × Area
thus,
Force exerted will be =
× 15 × 10⁻⁴m²
or
Force exerted will be = 23.99N
force goes as 1/d^2 ... (2d)^2 => 4d^2 ...
C) decrease by a factor of four
Answer: R = 28 degree
Explanation:
The given parameters are:
Refractive index n = 1.52
Incident angle I = 45 degree
According to Snell law,
Sin I/Sin R = n
Where
I = angle of incidence
R = angle of refraction
n = refractive index
Substitute all the parameters into the formula
1.52 = sin 45/ sin R
Make sinR the subject of formula
Sin R = sin 45/1.52
Sin R = 0.46520
R = sin^-1(0.46520)
R = 27.72 degree
Therefore, the angle of refraction will be 28 degrees approximately.