If a metal has a work function of 2.0 eV, what is the maximum kinetic energy of the emitted electrons when illuminated with light of 5.0 eV energy?
Practice Questions
1 question
Q1
If a metal has a work function of 2.0 eV, what is the maximum kinetic energy of the emitted electrons when illuminated with light of 5.0 eV energy?
3.0 eV
2.0 eV
5.0 eV
0 eV
The maximum kinetic energy can be calculated using KE = hf - φ. Here, KE = 5.0 eV - 2.0 eV = 3.0 eV.
Questions & Step-by-step Solutions
1 item
Q
Q: If a metal has a work function of 2.0 eV, what is the maximum kinetic energy of the emitted electrons when illuminated with light of 5.0 eV energy?
Solution: The maximum kinetic energy can be calculated using KE = hf - φ. Here, KE = 5.0 eV - 2.0 eV = 3.0 eV.
Steps: 5
Step 1: Understand the work function (φ). The work function is the minimum energy needed to remove an electron from the metal. In this case, φ = 2.0 eV.
Step 2: Understand the energy of the light (hf). The energy of the light that hits the metal is given as 5.0 eV.
Step 3: Use the formula for maximum kinetic energy (KE). The formula is KE = hf - φ.
Step 4: Substitute the values into the formula. KE = 5.0 eV - 2.0 eV.
Step 5: Calculate the maximum kinetic energy. KE = 3.0 eV.
