Answer:
475 N/C
Explanation:
As we know that, the electric field in parallel plate capacitor is same (constant) throughout. And is potential gradient.
So, Electric field is given by
Electric field = potential gradient
![Electric FIeld = \frac{Change\: in\: Potential}{Distance}](https://tex.z-dn.net/?f=Electric%20FIeld%20%3D%20%5Cfrac%7BChange%5C%3A%20in%5C%3A%20Potential%7D%7BDistance%7D)
Here, the potential change is 3.8V and the distance from negative plate to positive plate is 1.6 cm. The potential from negative plate to the center is (1.6/2)cm i.e., 0.8 cm.
But we have to take distance in SI units So, distance=![0.8 \times 10^{-2} m](https://tex.z-dn.net/?f=0.8%20%5Ctimes%2010%5E%7B-2%7D%20m)
So, Electric field is
![Electric\: field=\frac{3.8V}{0.8 \times 10^{-2}m }](https://tex.z-dn.net/?f=Electric%5C%3A%20field%3D%5Cfrac%7B3.8V%7D%7B0.8%20%5Ctimes%2010%5E%7B-2%7Dm%20%7D)
![Electric\: field=475 V/m](https://tex.z-dn.net/?f=Electric%5C%3A%20field%3D475%20V%2Fm)
So, electric field is 475 Volts per meter.
Note : Also we can say 475 Newtons per coulomb
Answer:
density of liquid 0.848 g/ml
Explanation:
from the information given in the question
mass of water = 34.914 - 25.296 = 9.618 g
volume of pycnometer = volume of water
which will be equal to ![= \frac{ mass}{density}](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B%20mass%7D%7Bdensity%7D)
![= \frac{9.618}{0.9970} = 9.646 ml](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7B9.618%7D%7B0.9970%7D%20%3D%209.646%20ml)
mass of liquid =33.485-25.296 = 8.189 ml
density of liquid![= \frac{mass}{volum\ of\ liquid}](https://tex.z-dn.net/?f=%3D%20%5Cfrac%7Bmass%7D%7Bvolum%5C%20of%5C%20liquid%7D)
= ![\frac{8.189}{9.646} =0.848 g/ml](https://tex.z-dn.net/?f=%5Cfrac%7B8.189%7D%7B9.646%7D%20%3D0.848%20g%2Fml)
The water is already at its boiling point
![(T=100^{\circ}C)](https://tex.z-dn.net/?f=%28T%3D100%5E%7B%5Ccirc%7DC%29)
, therefore we don't need additional heat to increase its temperature. Instead, we have to give the heat necessary to make it evaporate. The energy needed is equal to
![Q=m L_v](https://tex.z-dn.net/?f=Q%3Dm%20L_v)
where
m is the mass of the water
Lv is the latent heat of evaporation
The latent heat of evaporation of water is
![L_v = 2265 J/g](https://tex.z-dn.net/?f=L_v%20%3D%202265%20J%2Fg)
, and the mass of this sample of water is
![m=18.0 g](https://tex.z-dn.net/?f=m%3D18.0%20g)
, therefore the heat needed to vaporize the water is
Answer:
L = 0.1379 m = 13.79 cm
Explanation:
The Rayleigh criterion establishes that two objects are separated when the maximum of diffraction for slits coincides with the minimum of the other point, therefore the expression for the diffraction
a sin θ = m λ
the first zero occurs when m = 1
let's use trigonometry to find the angle
tan θ = y / L
as in these experiments the angles are very small
tan θ = sin θ /cos θ = sin θ
sin θ = y / L
we substitute
a y /L = λ
In the case of circular aperture the system must be solved in polar coordinates, for which a numerical constant is introduced
a y / L = 1.22 λ
L = a y / 1.22 λ
We search the magnitudes to the SI system
a = 1.04 cm = 1.04 10⁻² m
y = 9.09 10⁻⁶ m
λ = 562 10⁻⁹ m
let's calculate
L =
L = 1.379 10⁻¹ m
L = 0.1379 m = 13.79 cm