How many photons are contained in a burst of yellow light (589 nm) from a sodium lamp that contains 623 kj of energy?

1.847*10^24 photons

Explanation:

Generally, a photon has certain amount of energy which can be calculated using the equation below:

E = (h*c)/λ

Where:

E = energy of the a photon (J)

h = Planck's constant = 6.626*10^-34 (J.s)

c = speed of light = 299792458 (m/s)

λ = wavelength = 589 nm = 589*10^-9 m

Therefore:

E = (6.626*10^-34 * 299792458)/589*10^-9 = 3.373*10^-19 J

The energy of one photon is equivalent to 3.373*10^-19 J. Therefore, to find the number of photons in 623 kJ of energy, we have:

Number of photons = 623000/3.373*10^-19  = 1.847*10^24 photons

Thus, there are 1.847*10^24 photons in 623 kJ of energy.

your answer would be a. 12.5 kg

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .