Question

1) Which of the following statements is (are) true?

I.An excited atom can return to its ground state by absorbing electromagnetic radiation.

II.The energy of an atom is increased when electromagnetic radiation is emitted from it.

III.The energy of electromagnetic radiation increases as its frequency increases.

IV.An electron in the n = 4 state in the hydrogen atom can go to the n = 2 state by emitting electromagnetic radiation at the appropriate frequency.

V.The frequency and wavelength of electromagnetic radiation are inversely proportional to each other.

A) II, III, IV

B) III, V

C) I, II, III

D) III, IV, V

E) I, II, IV

Answer 1

D) III, IV, V is correct.

I) FALSE

Because atom can return in its ground state by emitting electromagnetic radiation.

II) FALSE

Because the energy of an atom is decreased when electromagnetic radiation is emitted from it.

III) TRUE

We know that the relation of energy and frequency is as follows

E = hv

From the above equation it is clear that as E increases, v increases

Therefore, the energy of electromagnetic radiation increases as its frequency increases.

IV) TRUE

Because electrons can release energy since n = 4 is excited and n = 2 is lower

V) TRUE

The frequency and wavelength of electromagnetic radiation are inversely proportional to each other.

Thus D) III, IV, V is correct.