Complete Question
One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. Having recently studied optics in your physics class, you're not too surprised to see that the patch of light seems to be a circular diffraction pattern. It appears that the central maximum is about 2 cm across, and you estimate that the distance from the window shade to the wall is about 5 m.
Required:
Estimate the diameter of the pinhole.
Answer:
The diameter is
Explanation:
From the question we are told that
The central maxima is
The distance from the window shade is
The average wavelength of the sun is mathematically evaluated as
Generally the visible light spectrum has a wavelength range between 400 nm to 700 nm
So the initial wavelength of the sun is
and the final wavelength is
Substituting this into the above equation
The diameter is evaluated as
substituting values
It is important to note that the electromagnetic spectrum has a variety of wavelength and frequency of light in it. Some lights we can see, while others are not visual to our naked eye. It is actually very important to determine the kind of light as different lights have different wavelengths and frequencies. some lights are of very high frequency like the gamma rays, while others are of far lower frequency. <span />
Answer:
The magnitude of the electric force of attraction between an iron nucleus is .
Explanation:
Charge on an iron nucleus,
The separation between the iron nucleus is,
There is an electric force or repulsion between two charges. It is given by :
F = 0.0692 N
or
So, the magnitude of the electric force of attraction between an iron nucleus is . Hence, this is the required solution.
Ah hah ! That description fits things like mass, linear momentum,
energy, angular momentum, electric charge, and politicians. They
never appear or disappear, they just move from place to place.
We say that those quantities are conserved.