Explanation:
The given data is as follows.
V = 0.389 L = 0.389 kg
m = 389 g of water (as 1 kg = 1000 g)
wavelength = 12.9 cm
dT =
First, we will identify the heat absorbed as follows.
Q =
Putting the given values into the above formula as follows.
Q =
Q =
= 128090.231 J
Now, as we know that
Energy (E) =
or,
where, h = Planck's Constant = J s
c = speed of particle (i.e. light) = m/s
E = energy per particle J/photon
Hence, calculate the energy as follows.
E =
(As 1 m = 100 cm)
= J/photons
Hence, number of photons present will be calculated as follows.
n photons =
=
=
=
Thus, we can conclude that number of photons released are .
It is a physical change because it is still the same thing (a pretzel) but just in two pieces. You’re not changing chemical composition.
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The answer to this is c i believe