Question:
The metal which has the highest work function in the following is:
The metal which has the highest work function in the following is:
Show Hint
Platinum has one of the highest work functions among metals, making it harder to emit electrons.
Updated On: May 18, 2025
- Cesium (Cs)
- Sodium (Na)
- Aluminium (Al)
- Platinum (Pt)
Hide Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Work function is the minimum energy required to eject an electron from the metal surface. Platinum has a very high work function (~5.6 eV), whereas Cesium and Sodium have low values (~2.1 eV and ~2.3 eV respectively), and Aluminium is moderate (~4.3 eV).
Was this answer helpful?
0
0
Top Questions on Photoelectric Effect
- The cut-off voltage \( V_0 \) versus frequency \( \nu \) of the incident light curve is a straight line with a slope of \( \frac{h}{e} \). Explain this observation.
- CBSE CLASS XII - 2025
- Physics
- Photoelectric Effect
- Explain the following observations using Einstein’s photoelectric equation:
(a) Photoelectric emission does not occur from a surface when the frequency of the light incident on it is less than a certain minimum value.
(b) It is the frequency, and not the intensity of the incident light which affects the maximum kinetic energy of the photoelectrons.
(c) The cut-off voltage \( V_0 \) versus frequency \( \nu \) of the incident light curve is a straight line with a slope \( \frac{h}{e} \).
- CBSE CLASS XII - 2025
- Physics
- Photoelectric Effect
- Two statements are given, one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer from the codes (A), (B), (C), and (D) as given below.
Assertion (A): For monochromatic incident radiation, the emitted photoelectrons from a given metal have speed ranging from zero to a certain maximum value.
Reason (R): Each metal has a definite work function.
- CBSE CLASS XII - 2025
- Physics
- Photoelectric Effect
- The threshold frequency for a given metal is \( 3.6 \times 10^{14} \) Hz. If monochromatic radiations of frequency \( 6.8 \times 10^{14} \) Hz are incident on this metal, find the cut-off potential for the photoelectrons.
Given: - Threshold frequency, \( \nu_0 = 3.6 \times 10^{14} \) Hz
- Frequency of incident radiation, \( \nu = 6.8 \times 10^{14} \) Hz
- Planck's constant, \( h = 6.63 \times 10^{-34} \, \text{J} \cdot \text{s} \)
- Charge of the electron, \( e = 1.6 \times 10^{-19} \, \text{C} \)- CBSE CLASS XII - 2025
- Physics
- Photoelectric Effect
Einstein's Explanation of the Photoelectric Effect:
Einstein explained the photoelectric effect on the basis of Planck’s quantum theory, where light travels in the form of small bundles of energy called photons.
The energy of each photon is hν, where:- ν is the frequency of the incident light
- h is Planck’s constant
The number of photons in a beam of light determines the intensity of the incident light.When a photon strikes a metal surface, it transfers its total energy hν to a free electron in the metal.A part of this energy is used to eject the electron from the metal, and this required energy is called the work function.The remaining energy is carried by the ejected electron as its kinetic energy.
- CBSE CLASS XII - 2025
- Physics
- Photoelectric Effect
View More Questions
Questions Asked in AP EAPCET exam
- If \(x^2 + y^2 = 25\) and \(xy = 12\), then what is the value of \(x^4 + y^4\)?
- If \( i = \sqrt{-1} \), then \[ \sum_{n=2}^{30} i^n + \sum_{n=30}^{65} i^{n+3} = \]
- AP EAPCET - 2025
- Complex numbers
- If $ 0 \le x \le 3,\ 0 \le y \le 3 $, then the number of solutions $(x, y)$ for the equation: $$ \left( \sqrt{\sin^2 x - \sin x + \frac{1}{2}} \right)^{\sec^2 y} = 1 $$
- AP EAPCET - 2025
- Functions
- The number of all five-letter words (with or without meaning) having at least one repeated letter that can be formed by using the letters of the word INCONVENIENCE is:
- AP EAPCET - 2025
- Binomial Expansion
- If \( \log_2 3 = p \), express \( \log_8 9 \) in terms of \( p \):
- AP EAPCET - 2025
- Exponential and Logarithmic Functions
View More Questions