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The energy E of a photon is E= h x f , where f is the frequency, and h is Planck's constant.
h=6.63e-34 [aka 6.63 x 10^-34] J s (Joule-seconds)
The frequency f of a photon is related to its wavelength by
f=speed of light/wavelength
Speed of light c=3e8 m/s.
From this you can calculate the energy of a 600nm photon, and then the number of those photons required to get 4e-17 Joules.
Your answer should be between 50 and 500, but you can do the math.
What else can I help you with?
The color of light is determined by its?
Wavelength, or alternatively its frequency.
How are the wavelenght and energy of a photon related?
The energy of a photon is directly proportional to the frequency. Since the frequency is inversely proportional to the wavelength, the energy, too, is inversely proportional to the wavelength.
How are color wavelength and photon energy related?
Color wavelength and photon energy are inversely related. This means that as the wavelength of light decreases and the frequency increases, the energy of the photons also increases. Shorter wavelengths correspond to higher energy photons, such as in the case of ultraviolet light having higher energy than visible light.
What happens to the energy of photons if the wavelength of light is doubled?
When the wavelength of light is doubled, the energy of photons decreases by half.
Does wavelength of the incident rays play a role in the phenomenon of photoelectric effect?
Yes definitely. Reciprocal of wavelength is proportional to frequency as lambda = v /frequency. v - the speed of the wave. The frequency has to be greater than some minimum value known to be the threshold frequency. As frequency increases then kinetic energy of the photo electron also increases. If the frequency of the incident photon is less than the threshold and however higher the intensity, there is no chance of ejection of photo electron right from the surface of the substance. So no photo electric emission is possible.
The color of light is determined by its?
Wavelength, or alternatively its frequency.
How are the wavelenght and energy of a photon related?
The energy of a photon is directly proportional to the frequency. Since the frequency is inversely proportional to the wavelength, the energy, too, is inversely proportional to the wavelength.
How are color wavelength and photon energy related?
Color wavelength and photon energy are inversely related. This means that as the wavelength of light decreases and the frequency increases, the energy of the photons also increases. Shorter wavelengths correspond to higher energy photons, such as in the case of ultraviolet light having higher energy than visible light.
What happens to the energy of photons if the wavelength of light is doubled?
When the wavelength of light is doubled, the energy of photons decreases by half.
What is the longest wavelength photon?
There is no longest wavelength for photons. It can be arbitrarily long.
A photon of wavelength 3000 A is absorbed by a gas and remitted as two photons One of the photons is red 7600 A What is the wavelength of the other photon?
The total energy of a photon with a wavelength of 3000 A is divided into two photons, one red photon with a wavelength of 7600 A, and another photon with a shorter wavelength. To calculate the wavelength of the second photon, you can use the conservation of energy principle, where the sum of the energies of the two new photons is equal to the energy of the original photon. This will give you the wavelength of the other photon.
Which color has the least amount of energy per photon?
High-energy photons correspond to short-wavelength light while low-energy photons correspond to long-wavelength light. In short, the answer is red. For short-wavelengths (high energy photons) it would appear blue.
Does wavelength of the incident rays play a role in the phenomenon of photoelectric effect?
Yes definitely. Reciprocal of wavelength is proportional to frequency as lambda = v /frequency. v - the speed of the wave. The frequency has to be greater than some minimum value known to be the threshold frequency. As frequency increases then kinetic energy of the photo electron also increases. If the frequency of the incident photon is less than the threshold and however higher the intensity, there is no chance of ejection of photo electron right from the surface of the substance. So no photo electric emission is possible.
How does the amount of energy in the light changes as the wavelength increases?
The energy of the photons decreases as the wavelength increases
What is the measure of a photons energy?
A photon's energy is determined by its frequency or wavelength, according to the equation E=hf, where E is energy, h is Planck's constant, and f is frequency. In general, higher frequencies (or shorter wavelengths) correspond to photons with higher energy.
How does a plant frow in artificial lighting?
Same way it grows in sunlight. Photons of light at the right wavelength impact the pigment chlorophyll, excite and electron from the pigment which then enters photosystem II. Photons of the correct wave length are photons of the correct wavelength and the plant does not care what the source is of these photons.
What Photons with the highest energy have the blank?
The highest energy photons have the shortest wavelength, which is in the gamma ray range. Gamma rays are a form of electromagnetic radiation that have the highest energy and shortest wavelength in the electromagnetic spectrum.
