Why does ice float on water? A. The temperature of ice is lower than the temperature of water. B. The temperature of water and i
2 answers:
Answer:
C. The density of ice is less than the density of water.
Explanation:
As we know that when ice floats on the water then we can say that
Buoyancy force on ice will be counterbalanced by the weight of ice block
So here we have
now we say that for flotation of ice cube the buoyant force must be greater than the force of gravity
so here we can say
so here density of ice will be less than the density of water
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To develop this problem it is necessary to apply the Rayleigh Criterion (Angular resolution)criterion. This conceptos describes the ability of any image-forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of image resolution. By definition is defined as:
Where,
= Wavelength
d = Width of the slit
= Angular resolution
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The radius of the beam on the moon is
Relacing
Replacing with our values we have that,
Therefore the diameter of the beam on the moon is
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Answer:
2.11eV
Explanation:
We know that speed of light is it's wavelength times frequency.
Planck's constant is
The energy gap is calculated by multyplying the light's frequency by planck's constant:
Hence, the energy gap is 2.11eV