What wavelength of radiation has photons of energy 2.87×x10−18 j?
1 answer:
The energy of a photon is given by
where h is the Planck constant and f is the frequency of the light.
Given the relationship between the frequency f, the wavelength
and the speed of light c for an electromagnetic wave:
we can rewrite the energy of the photon as
and by substituting
, 
and 
, we get the wavelength of the photon:
where h is the Planck constant and f is the frequency of the light.
Given the relationship between the frequency f, the wavelength
we can rewrite the energy of the photon as
and by substituting
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Given :
An 80kg sled rider starts sledding down a 100m hill from rest. If her final velocity is 15m/s.
To Find :
The acceleration down the hill.
The force needed for that kind of acceleration.
Solution :
By equation of motion :
Force required is, F = ma
F = 80×1.125 N
F = 90 N
Hence, this is the required solution.