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If a metal has a work function of 4 eV, what is the threshold frequency for the
If a metal has a work function of 4 eV, what is the threshold frequency for the photoelectric effect?
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Q1
If a metal has a work function of 4 eV, what is the threshold frequency for the photoelectric effect?
1.5 x 10^14 Hz
3.2 x 10^14 Hz
5.0 x 10^14 Hz
6.3 x 10^14 Hz
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The threshold frequency can be calculated using the formula f = φ/h, where h is Planck's constant (4.14 x 10^-15 eV·s).
Questions & Step-by-step Solutions
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Q
Q: If a metal has a work function of 4 eV, what is the threshold frequency for the photoelectric effect?
Solution:
The threshold frequency can be calculated using the formula f = φ/h, where h is Planck's constant (4.14 x 10^-15 eV·s).
Steps: 6
Show Steps
Step 1: Understand the work function (φ). It is given as 4 eV. This is the minimum energy needed to remove an electron from the metal.
Step 2: Know the formula to find the threshold frequency (f). The formula is f = φ/h, where h is Planck's constant.
Step 3: Identify Planck's constant (h). It is approximately 4.14 x 10^-15 eV·s.
Step 4: Plug the values into the formula. Substitute φ with 4 eV and h with 4.14 x 10^-15 eV·s.
Step 5: Calculate the threshold frequency (f). Use the formula: f = 4 eV / (4.14 x 10^-15 eV·s).
Step 6: Perform the division to find the value of f.
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