I know the answer isn't 6.7 times 10 to the -3 because i got that wrong on my test
Answer:
Approximately 3 photons
Explanation:
The energy of a photon at the peak of visual sensitivity is given by:
where
h is the Planck constant
c is the speed of light
is the wavelength of the photon
Substituting into the formula,
This is the energy of one photon. The human eye can detect an amount of energy of
So the amount of photons contained in this energy is
so approximately 3 photons.
The weight of anything in any place is
(mass of the thing) x (acceleration of gravity in that place).
-- On Earth, the acceleration of gravity is about 9.807 m/s²
Weight of 19 kg of mass is (19 kg) x (9.807 m/s²) = <em>186.3 newtons</em>
-- On the Moon, the acceleration of gravity is about 1.623 m/s²
Weight of the same 19 kg of mass is (19 kg) x (1.623 m/s²) = <em>30.8 newtons</em>