Apair of students measure the intensity of light from a desklamp in sec. 4.5 of the experiment. when the detector is 25 cm from the lamp, the signal measured by the detector is 0.74 v. how large a signal (in v) do the students expect when the detector is 69 cm away?

I₂ = 0.0971 V

Explanation:

Light is an electromagnetic wave that expands uniformly throughout the space, after it is created, so that the energy is conserved, it must be distributed on the surface of the expansion sphere. The surface area of the sphere is

    A = 4 π R²

The first surface has I₁ = 0.74 V with a radius of 0.25 m

    I₁ = E / A₁

On the second surface that is rn r = 0.69 m

    I₂ = E / A₂

Let's clear let's calculate

    E = I₁ A₁ = I₂ A₂

    I₁ A₁ = I₂  A₂

    I₂ = I₁  A₁ / A₂

    I₂ = I₁ 4 π r₁² / 4 π r₂²

    I₂ = I₁ r₁² / r₂²

calculate

    I₂ = 0.74 0.25² /0.69²

    I₂ = 0.0971 V

i sometimes feel that way too. i feel that i should hurt someone because they hurt me, but i wouldnt do it. that would make things so much worse i have so much experience with this stuff

explanation:

cell differentiation  is how generic embryonic  cells  become specialized  cells. this occurs  through a process called gene expression. gene expression is the specific combination of genes that are turned on or off (expressed or repressed), and this is what dictates how a  cell  functions.

explanation: