Question

Which of the following statements is incorrect? Group of answer choices The product of wavelength and frequency of electromagnetic radiation is a constant. As the energy of a photon increases, its frequency decreases. As the wavelength of a photon increases, its frequency decreases. As the frequency of a photon increases, its wavelength decreases. As the wavelength of a photon increases, its energy decreases.

Answer 1

Answer: Option (b) is the correct.

Explanation:

It is known that energy is directly proportional to frequency.

Mathematically,              $E \propto \nu$

or,                           E = $h \times \nu$ ............ (1)

where,     E = energy

                h = Plank's constant

              $\nu$ = frequency

This relation shows that higher is the energy then more will be the frequency of electrmagnetic radiation.

Also,     $\nu = \frac{c}{\lambda}$ ......... (2)

where,          c = speed of light

                 $\lambda$ = wavelength

Therefore, substituting value of $\nu$ from equation (2) into equation (1) as follows.

                 E = $h \times \nu$

                 E = $h \times \frac{c}{\lambda}$

This relation shows that higher is the energy then lower will be the wavelength.

Thus, we can conclude that as the energy of a photon increases, its frequency decreases, is incorrect statement.