00:01
Hello students, in this question we have given the lambda of the that is wavelength which is equal to 275 nanometer or we can say that 275 multiplied 10 to raise to power 9 meters.
00:18
From this we can calculate the energy energy is equal to hc divided by lambda.
00:26
So the h is planx constant that is 6 .6 .26 multiplied 10 to raised power 34, which is multiplied by c, that is light speed of light, which is equal to 3 .10 to 10 to power minus 8.
00:43
And lambda is 275 multiplied 10 to raised power minus 9 meters.
00:52
From here we can calculate the e which comes out to be 2 .73 multiplied 10 to raise power minus 19 jules.
01:03
So this is a required energy.
01:06
Now we can use the formula pv is equals to nrt to calculate the n.
01:14
That is pv is equals to nrt.
01:18
Here pressure is convert into 1 .8.
01:23
80m that is 50 multiplied 10 to raise power minus 3 tor which is given and the standard is 760 torr multiplied by 450 into 10 to raise power minus 3 liters which is equals to n multiply r is 0 .0281 liters 80m kelvin inverse mole inverse or mole multiplied 298 .15 that is in kelvin.
02:07
From this on solving we get n is equal to 1 .507 multiplied 10 to 0 .507 multiplied 10 to raise power minus 7 moles...