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# What is the energy of a photon that emits a light of freqeuncy7.21x1014hz?

Updated: 9/22/2023 Wiki User

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Q: What is the energy of a photon that emits a light of freqeuncy7.21x1014hz?
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4.25 10-19 j

### Is energy is conserved when an atom emits a photon of light?

Energy is ALWAYS conserved. The appropriate sum of mass and energy is always conserved. If an atom emits a photon, the atom has less energy/mass, and the universe minus that atom has more energy/mass. It's like carrying some energy from here to there.

4.78 x 10-19

2.96 x 10^-19 J

### The light bearing packet of energy emitted by an electron is called a?

A packet of light energy is called a photon.

### What happens when the electrons return from the excited state to the ground state?

it looses energy , it gives off light in the form of a single photon.

### What is the energy of photon that emits a light of frequency (4.47)(10 exponent 14) Hz?

The energy is 2,9619.e-19 J.

### What is the energy in a photon of light proportional to?

The amount of energy in a photon of light is proportional to the frequency of the corresponding light wave.... frequency of the electromagnetic radiation of which the photon is a particle.

### An atom that undergoes excitation and de-excitation emits?

A quanta of light (one photon).

### When metal is heated the light emitted is because it gains energy as they return to lower energy levels?

Just the opposite. As an electron returns to a lower energy level, it emits a packet (quantum) of energy that may be a visible photon.

### What is a fixed quantity of light energy?

Wikipedia says that a photon is a fixed quantity of light energy.

### When electron drops to a lower energy level what is the energy of the proton released?

You may be confusing "proton" with "photon". A proton is a positively-charged particle contained within the nucleus of an atom. A photon is a discrete unit of energy normally expressed as light. Around the nucleus of the atom, there are some electrons in energy levels. When an atom absorbs energy, it absorbs a specific amount, or "quantum" of energy and the electron boosted to a higher energy level. When the electron drops to a lower energy level, it emits a photon in the form of light at a specific energy and frequency.