Please help me :( 1.) A laser emits light of frequency = 4.74 x 1014 sec-1. What is the wavelength of the light in nm?

2.) A certain electromagnetic wave has a wavelength of 625 nm.
a.) What is the frequency of the wave?
b.) What region of the electromagnetic spectrum is it found?
c.) What is the energy of the wave?

Ahypothesis must be testable and falsifiable to be considered scientific a. trueb. false

For the reaction shown, calculate how many moles of no2 form when each of the following completely reacts. 2n2o5(g)→4no2(g)+o2(g) part a 1.0 mol n2o5 express your answer using two significant figures. nothing mol m o l request answer part b 5.4 mol n2o5 express your answer using two significant figures.

Consider the following unbalanced equation for the combustion of hexane: αc6h14(g)+βo2(g)→γco2(g)+δh2o(g) part a balance the equation. give your answer as an ordered set of numbers α, β, γ, use the least possible integers for the coefficients. α α , β, γ, δ = nothing request answer part b determine how many moles of o2 are required to react completely with 5.6 moles c6h14. express your answer using two significant figures. n n = nothing mol request answer provide feedback