Photon has no rest mass but when photon travels at the speed of light, it gains momentum.
The energy of the photon is E= pc, c = speed of the photon and p= its momentum.
∴ E = pc
but p = h/λ (This comes from De-broglie's theory)
∴ E = hc/λ
frequency = ν = c/λ
∴E = hν
Answer:
2.6 moles are present in the given number of atoms of zinc.
Explanation:
It is known that 1 mole of any element contains Avagadro's number of atoms. So
Then,
moles
As here it is given that there is 1.58 * atoms of Zinc, then the number of moles in these number of atoms will be
moles
Hence, there are 2.6 moles in 1.58 * 10^24 atoms of zinc
A person is attracted towards the center of Earth by a 440 N gravitational force. The force with which Earth is attracted toward the person is <u>440 N</u>.
<u><em>Reason</em></u><em>: If you were to consider Newton's third law, it says for every action, there is an equal and opposite reaction. That means if the earth exerts a 440N force on the human, then the human will exert a 440N force on the planet.</em>
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p.s. Newton's three laws would be very helpful to know for these sorts of conceptual questions that involve forces
Hello this is to other people looking for the answer. Everyone else is wrong. I just took the quiz on e2020. The answer actually Comparative. Your welcome. Have a nice day.
Answer:
Explanation:
Given data:
Momentum of moving model train,
Mass of the stationary model train,
Initial speed of the stationary model train,
Assume there is no external force is acting on the given train system.
In this case, the total linear momentum of the trains would be conserved.
Let the final linear momentum of the trains be
Thus,