The potential energy of the object is 78.4 J
Explanation:
The gravitational potential energy (GPE) of an object is the energy possessed by the object due to its position in a gravitational field.
For an object near the Earth's surface, the GPE is given by:
where
m is the mass of the object
is the acceleration of gravity near the Earth's surface
h is the height of the object relative to the surface
For the object in this problem,
m = 2 kg
h = 4 m
Substituting, we find its GPE:
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Answer:
Explanation:
The energy of a photon is given by:
(1)
Where:
is the Planck constant
is the frequency light
On the other hand, there is an inverse relationship between and the wavelength
:
(2)
Where:
is the speed of light
is the wavelength
Substituting (2) in (1):
(3)
Finally:
This is the energy of a photon of blue light, in Joules.