# How do you calculate the number of photoelectrons emitted per second?

## How do you calculate the number of photoelectrons emitted per second?

According to the equation E=n⋅h⋅ν (energy = number of photons times Planck’s constant times the frequency), if you divide the energy by Planck’s constant, you should get photons per second.

## How many photons are emitted per second?

Thus the number of photons emitted per second =3.

**How do you calculate photoelectrons?**

The maximum kinetic energy of a photoelectron is given by 𝐸 = ℎ 𝑐 𝜆 − 𝑊 , m a x where ℎ is the Planck constant, 𝑐 is the speed of light, 𝜆 is the wavelength of the incident photon, and 𝑊 is the work function of the metal surface.

**How do you calculate number of photons?**

The number of photons of a particular wavelength in a given energy is calculated by use of the equation for photon energy, E = hc/λ (where h is Planck’s constant).

### How many photons are emitted per second by a 60 watt bulb?

So, in order to emit 60 Joules per second, the lightbulb must emit 1.8 x 1020 photons per second.

### How many photons are emitted by the light source in each second?

There are 1.12 x 1016 photons per second produced by a 1-lumen source over the interval from 400 to 700 nm or the units can be taken to be 1.12 x 1016 photons per (lumen-second).

**How many photons are emitted per second by the sun?**

1,383,279,502,884,197,169,399,375,105,820,974,944,592,307,816 photons/s.

**What is the formula for photoelectric effect?**

By conservation of energy, this reasoning led Einstein to the photoelectric equation Ek = hf − ϕ, where Ek is the maximum kinetic energy of the ejected electron.

#### How many photons are emitted per second by the bulb?

So, in order to emit 60 Joules per second, the lightbulb must emit 1.8 x 1020 photons per second. (that’s 180,000,000,000,000,000,000 photons per second!)

#### How many photons SEC are emitted by a 100 watt light bulb?

If, for instance, you are calculating all the photons emitted by a 100-watt bulb: 100 / (3.06 x 10^-19) = 3.27 x 10^20. This is the number of photons that the light carries each second.

**How many moles of photons are emitted every second by this laser?**

A laser pointer typically has a power rating of 1 mW, or 0.001 Joules per second. This means that every second a laser pointer emits a number of photons equal to (3.2x1018photons/J)(0.001J/s) = 3.2×1015 photons/s.

**How do you calculate the speed of an electron?**

At speeds greater than the 1/10th of the speed of light, we must use the relativistic formula to find an electron’s velocity in an electric field: v rel = c 1 − 1 ( 1 + e V a m 0 c 2 ) 2 .

## What is frequency in photoelectric effect?

In radiation: The photoelectric effect. The photoelectric threshold frequency, symbolized by the Greek letter nu with subscript zero, ν0, is that frequency at which the effect is barely possible; it is given by the ratio of the work function symbolized by the Greek letter psi, ψ, to Planck’s constant (ν0 =…

## How many photons second are emitted by a 100 watt light bulb?

**What is the speed of photons?**

All massless particles always travel at a speed represented by the letter c, whereas massive particles can travel at any speed between zero and c. Since photons are massless, they travel at c, which is called the speed of light because the photon was the first known example of a massless particle.

**What is the speed of electron flow?**

about 1 cm/sec.

An electron travels at a speed of about 1 cm/sec. This is about as fast as an ant scurries on the ground. With this simple analysis, we see that the speed of an electron in a wire is incredibly slow compared to the speed of light in air.

### What is intensity in photoelectric effect?

The intensity affects the number of electrons, and the frequency affects the kinetic energy of the emitted electrons.

### Do photons travel faster than electrons?

In a chemistry class today someone asked if electrons moved faster than light, and our teacher couldn’t answer. She just said that “Photons and electrons are both really fast.”

**How fast do electrons go?**

A calculation shows that the electron is traveling at about 2,200 kilometers per second. That’s less than 1% of the speed of light, but it’s fast enough to get it around the Earth in just over 18 seconds. Read up on what happens when nothing can go faster than the speed of light.

**What does the number of photoelectrons emitted per second depend on?**

>> The number of photo electro… The number of photo electrons emitted per second depend on the ____________ of incident radiatic. In Photoelectric effect, the number of photo electrons emitted per second depend on intensity of the incident radiation. Was this answer helpful?

#### Why is the photoelectric yield higher at 2F than at 4F?

The workfunction threshold is given by the OP as f / 4, so f should be in the far UV. It is then likely that the photoelectric yield is higher at f / 2. And that it would be lower at 2 f (likely above the plasmon cutoff).

#### What determines the photoemission intensity of a material?

But photoemission intensities depend on details of the electronic structure of the material: its density of occupied states and also on the final states reached by vertical transitions in k -space. And at 2 f (eight times the work function) there might be emission from a shallow core level. Show activity on this post.