What wavelength photon is required to excite a hydrogen from the n=1 state to the n=3 state? what is the lowest frequency photon that will be observed?

Explanation:

It is given that,

Initial state of electron,

Final state of electron,

The wavelength of the excited electron is given by :

Where

R is Rydberg's constant

or

Let f is the frequency of the observed photon. It is given by :

Hence, this is the required solution.

it would be kevlar ^^

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards