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
Alkali metals like cesium and sodium have very low work functions, while noble and transition metals like platinum have much higher work functions.
Updated On: Jun 15, 2026
- Cesium (Cs)
- Sodium (Na)
- Aluminium (Al)
- Platinum (Pt)
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understand the meaning of work function.
The work function of a metal is the minimum energy required to remove an electron from the surface of the metal.
It is generally measured in electron volts (eV). Metals with tightly bound electrons have higher work functions.
Step 2: Compare the given metals.
The approximate work functions of the given metals are:
\[ \text{Cesium (Cs)} \approx 2.1\ \text{eV} \] \[ \text{Sodium (Na)} \approx 2.3\ \text{eV} \] \[ \text{Aluminium (Al)} \approx 4.2\ \text{eV} \] \[ \text{Platinum (Pt)} \approx 5.6\ \text{eV} \]
Among these, platinum has the maximum work function.
Step 3: Final conclusion.
Hence, the metal having the highest work function is
\[ \boxed{\text{Platinum (Pt)}} \]
The work function of a metal is the minimum energy required to remove an electron from the surface of the metal.
It is generally measured in electron volts (eV). Metals with tightly bound electrons have higher work functions.
Step 2: Compare the given metals.
The approximate work functions of the given metals are:
\[ \text{Cesium (Cs)} \approx 2.1\ \text{eV} \] \[ \text{Sodium (Na)} \approx 2.3\ \text{eV} \] \[ \text{Aluminium (Al)} \approx 4.2\ \text{eV} \] \[ \text{Platinum (Pt)} \approx 5.6\ \text{eV} \]
Among these, platinum has the maximum work function.
Step 3: Final conclusion.
Hence, the metal having the highest work function is
\[ \boxed{\text{Platinum (Pt)}} \]
Was this answer helpful?
0
0
Top AP EAMCET Physics Questions
- If only $\frac{1}{51}^{th}$ ot the main current is to be passed through a galvanometer then the shunt required is $R_1$ and if only $\frac{1}{11}^{th}$ of the main voltage is to be developed across the galvanometer, then the resistance required is $R_2$. Then $\frac{R_2}{R_1} =$
In the given circuit, the electric currents through $15\, \Omega$ and $6 \, \Omega$ respectively are
- In a nuclear reactor the activity of a radioactive substance is $2000 / s$. If the mean life of the products is $50$ minutes, then in the steady power generation, the number of radio nuclides is
- In a $p$ - type semiconductor the donor level is at $50 \,meV$ above the valence band. To produce one electron, the maximum wavelength of light photon required is (Planck's constant, $h=6.6 \times 10^{-34} \,Js$ and speed of light in vacuum, $c=3 \times 10^{8} \,ms ^{-1}$ )
- Potential energy of a body of mass $1\, kg$ free to move along X-axis is given by $U(x) = \left( \frac{x^2}{2} - x \right) J .$ If the total mechanical energy of the body is $2\, J$. then the maximum speed of the body is (Assume only conservative force acts on the body)
View More Questions
Top AP EAMCET Photoelectric Effect Questions
- In a $p$ - type semiconductor the donor level is at $50 \,meV$ above the valence band. To produce one electron, the maximum wavelength of light photon required is (Planck's constant, $h=6.6 \times 10^{-34} \,Js$ and speed of light in vacuum, $c=3 \times 10^{8} \,ms ^{-1}$ )
- A photon incident on a metal of work function 2 eV produced a photoelectron of maximum kinetic energy of 2 eV. The wavelength associated with the photon is:
- The maximum wavelength of light which causes photoelectric emission from a photosensitive metal surface is \( \lambda_0 \). Two light beams of wavelengths \( \frac{\lambda_0}{3} \) and \( \frac{\lambda_0}{9} \) incident on the metal surface. The ratio of the maximum velocities of the emitted photoelectrons is:
What is the equivalent resistance between the points A and B of the network?
A wire of resistance 0.2 \( \Omega/{cm} \) is bent to form a square ABCD of side 10 cm. A similar wire is connected between the corners B and D. If 2 V battery is connected across A and C, the power dissipated is
View More Questions
Top AP EAMCET Questions
- If $\int \cos x . \cos 2x . \cos 5x dx = A \; \sin 2x + B \sin 4x + C \sin 6x + D \sin 8x + k $ (where $k$ is the arbitrary constant of integration), then $\frac{1}{B} + \frac{1}{C} = $
- If $k$ is one of the roots of the equation $x^2 - 25x + 24 = 0 $ such that $A = \begin{bmatrix}1&2&1\\ 3&2&3\\ 1&1&k\end{bmatrix} $ is a non-singular matrix, then $A^{-1}$ =
- If only $\frac{1}{51}^{th}$ ot the main current is to be passed through a galvanometer then the shunt required is $R_1$ and if only $\frac{1}{11}^{th}$ of the main voltage is to be developed across the galvanometer, then the resistance required is $R_2$. Then $\frac{R_2}{R_1} =$
- If $p$ and $q$ are respectively the global maximum and global minimum of the function $f(x) = x^2 e^{2x}$ on the interval $[-2, 2]$ , then $pe^{-4} + qe^4 = $
- If $\displaystyle\sum^n_{k - 1} \tan^{-1} \left( \frac{1}{k^2 + k + 1} \right) = \tan^{-1} (\theta) $ , then $\theta$ =
View More Questions