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Planck's constant.

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What is the name given to heat energy at melting point?

The heat energy required to change a substance between solid & liquid at constant temperature is called the "latent heat of fusion". If the change is from solid to liquid the substance gains this energy. If the change is from liquid to solid the substance gives up this energy. The exact amount of latent heat of fusion is different for different substances.


Why do metals burn with different coloured flames?

Each metal has a different emmission spectrum because each metal has a different configuration of electrons. Since electrons can only emit specific amounts of energy and E=hv, where E=energy h=Planck's constant and v=vibrations per second, and E stays the same and h stays the same, the vibrations differ. Different vibrations mean different spots on the electromagnetic spectrum, and so there are different colors.


What is energy stored in particles of matter?

The total amount of energy is the mass of the matter multiplied by the speed of light, then multiplied by the speed of light again. This gives the formula e =mc2In fact the concept of 'massive' particles as lumps of 'stuff' is simplistic. "There is no energy without motion" Einstein said, so mass can only be motion, something akin to the 'wave bundle' corpuscle of light called the photon (which he got his Nobel Prize for 'finding'). The oscillation contains the energy just like in a gyroscope, the energy of momentum, and we can read the rate of oscillation by spectroscopy.So the form of the energy stored is oscillatory.


What will happen to plants if there is no heat energy?

the plants will die because heat gives energy to all plants and that is how plants make there own food


How does a laser ranging device work?

This device simply sends out a short pulse of light to the target, and measures the time to the the reflection. Knowing the speed of light, this gives distance. By a slight modification, if the target is moving, then the frequency of the reflected light will be different, due to the Doppler principle. Measuring this frequency change gives the speed at which the target is moving either towards or away. - Our laser speed gun.

Related questions

What happens when a hydrogen atom changes from the excited state to the ground state?

It gives off a photon of energy.


When the electrons are of an excited atom return to a lower energy state the energy emitted can result in the production of?

It depends on which state they fall from and in what element. The distance between the first and second energy level is large and all other jumps are even larger, also must questions involve Hydrogen. UV or X-Ray fro sure, probably X-Ray. To actually find out you will need to do the following.


Why do waves with frequencies high than visible light hurt us while those with lower frequencies do not affect us?

Lower frequency waves have less strength to penetrate. How bad a wave is all depends on how well it penetrates our bodies. Visible light doesn't penetrate our skin, but UV rays (higher than visible) can go through our skin, making it "bad" for us. High frequency waves have more energy and move faster which causes this penetration.


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.


The line emission spectrum of an atom is caused by the energies released when electrons?

The line emission spectrum of an atom is caused by the energies released when electrons fall from high energy level. It goes down to a low energy level and the extra energy it had from higher level is released as light.


Why does sodium vapor emit only certain frequencies of visible light?

It is because the electrons surrounding an atom, say sodium, can only exist at certain energy levels. When a photon (packet of light energy) hits an orbiting electron it only gives energy to that electron if the energy of the photon is exactly enough to move the electron to a higher energy level, if not it doesn't effect the electron. As the energy of a photon is directly proportional to the it wavelength, only certain wavelengths affect an atom's electrons. When they do effect the electrons the photon is absorbed, giving the absorption spectrum. Emission spectra are the reverse of this process, when an electron cascades back down to its lowest possible energy state after this photon interaction it gives out certain frequencies of light. The energy of this light will be equal to the energy absorbed, so the photons emitted will be equal to the photons absorbed which is why emission spectra look like the inverse of an absorption spectrum.


Do waves with a shorter wavelengths travel faster than waves with longer wavelengths?

The physical length, short wavelengths are shorter than long wavelengthsThe frequency, short wavelengths are higher frequency than long wavelengthsThe energy per photon, short wavelengths have more energy per photon than long wavelengths


What does the electron arrangement of any particular atom show?

The emission spectrum is your visible light spectrum, so it tells you your wavelength and frequency. Knowing this information allows you to calculate your photon energy (Eph = hv, where v = frequency and h = plank's constant). Hence, you know how much energy the electrons have and how much energy it takes to excite them from one energy level to the next (Eph).


What type of energy is given off by burning coal?

when burning coal it gives off heat energy


What energy is given off by the sun?

The sun gives solar energy which is made from the particles of heat that collide..


How is light produced in a light bulb?

When energy is given to the neon gas the electrons in its atoms become 'exited' and move up to a higher orbital (you could think of this like getting in a lift and moving from the ground level to the 3rd floor) As with anything what goes up it must come down, and as energy was needed to send it up to the higher orbital, energy is given out when it falls back down to its 'ground' level. This energy is given out in the form of a photon (a packet/wave of energy) depending on where it has come down from depends on the frequency of the wave and this in turn gives the colour. In other words if an electron gets exited to the 3rd orbital when it returns to the ground level it will give out one colour and if it gets exited to the 4th orbital when it falls it will give out a different colour. Science-teacher


How is light is produced in a neon bulb?

When energy is given to the neon gas the electrons in its atoms become 'exited' and move up to a higher orbital (you could think of this like getting in a lift and moving from the ground level to the 3rd floor) As with anything what goes up it must come down, and as energy was needed to send it up to the higher orbital, energy is given out when it falls back down to its 'ground' level. This energy is given out in the form of a photon (a packet/wave of energy) depending on where it has come down from depends on the frequency of the wave and this in turn gives the colour. In other words if an electron gets exited to the 3rd orbital when it returns to the ground level it will give out one colour and if it gets exited to the 4th orbital when it falls it will give out a different colour. Science-teacher