How many photons per second are emitted by the antenna of a microwave oven if its power output is 1.00 kw at a frequency of 2515
1 answer:
The power of the antenna is
and since the power is the emitted energy divided by the time, the energy emitted per second is
The frequency of the emitted photons is
So the energy of a single photon is
Therefore, to find the number of emitted photons per second, we should divide the total energy emitted by the antenna in 1 second by the energy of a single photon:
and since the power is the emitted energy divided by the time, the energy emitted per second is
The frequency of the emitted photons is
So the energy of a single photon is
Therefore, to find the number of emitted photons per second, we should divide the total energy emitted by the antenna in 1 second by the energy of a single photon:
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Answer:
According to Einstein's famous equation, matter can convert into energy (and viceversa) as follows:
where
E is the energy
m is the mass
c is the speed of light ()
Given the huge value of , we see that even a tiny amount of matter is able to release a huge amount of energy, when the whole mass is converted into energy. This is precisely what happens in nuclear reactions. For example, in the process of nuclear fusion (that occurs in the core of the stars), two light nuclei fuse together into a heavier nucleus. The mass of the final nucleus is lower than the total mass of the initial nuclei, so part of the mass has been converted into energy according to the equation above: this is why the amount of energy produced by stars is so big.