How many photons are produced in a laser pulse of 0.418 j at 633 i got 2.756635753 x 10^36 is that right?

That is not right.  There are 1.33 × 10¹⁸ photons .

Energy of one photon

E = hf = hc/λ = (6.626 × 10⁻³⁴ J·s × 2.998× 10⁸ m·s⁻¹)/(633 × 10⁻⁹ m)

= 3.138 × 10⁻¹⁹ J

Number of photons

No. of photons = 0.418 J × (1 photon/3.138 × 10⁻¹⁹ J) = 1.33 × 10¹⁸ photons

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

sorry i was late, but i don't know what assignment your talking about, i'm in flvs as well, im in earth space science. but u are behind pace bc every class should be in the 3's or 4'