If a laser light is compose of photons each with an energy of 4.58 × 10−19 j, what is the photon energy of this light in units of nanometers, nm? report your answer with correct significant figures and correct units.

Answer : The photon energy of this light in units of nanometers, (nm) is,

Solution :

Formula used :

where,

E = energy of photon =

h = Planck's constant =

c = speed of light =

= wavelength = ?

Now put all the given values in the above formula, we get:

conversion used :

Therefore, the photon energy of this light in units of nanometers, (nm) is,

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6