The particle of light emitted when at atom changes from a higher energy level to a lower energy level is called

Photon

Explanation:

The photon is the quantum of light. From a classifical point of view, ligth is a wave (an electromagnetic wave), but it also acts as made by particles (quanta of energy) called photons, and this behaviour is described by quantum mechanics.

When an atom changes from a higher energy level to a lower energy level, energy is released in the transition. This energy is carried away by a single photon of light. More specifically, the photon carries an energy which is equal to the difference in energy between the two levels of the atom:

And the frequency of the photon will depend on its energy, according to the equation

where

E is the photon's energy

h is the Planck constant

f is the photon's frequency

answer: he got 23

explanation:

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.