3 Lithium, sodium and potassium are in Group I of the Periodic Table. a The equation for the reaction of lithium with water is
2Li + 2H,
02LiOH+H,
i Write a word equation for this reaction.
ii Sodium reacts with water in a similar way to lithium.
Write a symbol equation for the reaction of sodium with water.
b Describe the reactions of lithium, sodium and potassium with water. In your description, write about:
the difference in the reactivity of the metals
the observations you would make when these metals react with water.

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explanation:

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m