MCQ
The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is
  • A
    4125 Å
  • B
    2062.5 Å
  • 3000 Å
  • D
    6000 Å

Answer

Correct option: C.
3000 Å
 3000 Å

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

Which of the following statement best describe Nuclear fusion reaction ?
The variation of potential with distance R from a fixed point is as shown below. The electric field at R = 5 m is








 
Hubble's law states that the velocity with which the 'milky way' is moving away from the earth is proportional to
A circuit consists of a coil with inductance $L$ and an uncharged capacitor of capacitance $C$. The coil is in a constant uniform magnetic field such that the flux through the coil is $\phi$. At time $t=0 \,min$, the magnetic field is abruptly switched $OFF$. Let $\omega_{0}=1 / \sqrt{L C}$ and ignore the resistance of the circuit.Then,
A potential difference of 2 V is applied between the opposite faces of a Ge crystal plate of area $1 cm^2$ and thickness 0.5 mm . If the concentration of electrons in Ge is $2 \times 10^{19} / m ^3$ and mobilities of electrons and holes are $0.36 \frac{ m ^2}{\text { volt-sec }}$ and $0.14 \frac{ m ^2}{\text { volt-sec }}$ respectively, then the current flowing through the plate will be
Threshold frequency for a metal is $10^{15}$ Hz. Light of $\lambda=400 \mathrm{~A}^0$ falls on its surface. Which of the following statements is correct
Select the correct statements. Coulomb’s law correctly describes the electric force that:
i. binds the electrons of an atom to its nucleus.
ii. binds the protons and neutrons in the nucleus of an atom.
iii. binds atoms together to form molecules.
A double charged lithium atom is equivalent to hydrogen whose atomic number is 3. The wavelength of required radiation for emitting electron from first to third Bohr orbit in $Li^{++}$ will be (Ionisation energy of hydrogen atom is 13.6eV) 
Identify the semiconductor devices whose characteristics are given below, in the order $(a),(b),(c),(d) $ 
The ionisation energy of hydrogen atom is $13.6 \,eV$. Following Bohr's theory, the energy corresponding to a transition between the $3^{rd}$ and the $4^{th}$ orbit is.....$eV$