Careful spectral analysis shows that the familiar yellow light of sodium lamps (such as street lamps) is made up of photons of two wavelengths, 589.0 nm and 589.6 nm. what is the difference in energy (in joules/mol) between one mole of photons with these wavelengths?

Answer : The energy difference for one mole of photon is 206.55 J/mol.

Explanation :

Formula used :

For two different wavelength the formula will be:

where,

= difference in energy of photon = ?

h = Planck's constant =

c = speed of light =

= wavelength of photon 1 = 589.0 nm =

conversion used :

= wavelength of photon 2 = 589.6 nm =

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

Energy difference for one mole of photon =

Energy difference for one mole of photon =

Therefore, the energy difference for one mole of photon is 206.55 J/mol.

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.