In the photoelectric effect, what is the effect of increasing the wavelength of incident light?
Practice Questions
1 question
Q1
In the photoelectric effect, what is the effect of increasing the wavelength of incident light?
Increases the kinetic energy of emitted electrons
Decreases the kinetic energy of emitted electrons
Has no effect on the photoelectric effect
Increases the number of emitted electrons
Increasing the wavelength decreases the frequency of the light, which reduces the energy of the incident photons, thus decreasing the kinetic energy of emitted electrons.
Questions & Step-by-step Solutions
1 item
Q
Q: In the photoelectric effect, what is the effect of increasing the wavelength of incident light?
Solution: Increasing the wavelength decreases the frequency of the light, which reduces the energy of the incident photons, thus decreasing the kinetic energy of emitted electrons.
Steps: 5
Step 1: Understand that light can be thought of as made up of tiny packets of energy called photons.
Step 2: Know that the energy of a photon is related to its frequency and wavelength. The formula is: Energy = Frequency x Planck's constant.
Step 3: Recognize that wavelength and frequency are inversely related. This means that if you increase the wavelength, the frequency decreases.
Step 4: Since energy is directly related to frequency, if the frequency decreases, the energy of the photons also decreases.
Step 5: In the photoelectric effect, when the energy of the incident photons decreases, the kinetic energy of the emitted electrons also decreases.
