MCQ
Why are alkali metals most suited as photo$-$sensitive metals?
- AHigh frequency
- BZero rest mass
- CHigh work function
- ✓Low work function
✓
Answer
Correct option: D.
Low work function
Alkali metals have low work functions. Even visible radiation can eject out electrons from them. So alkali metals are the most suitable photo$-$sensitive metals.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
An $e.m.f$. of $12$ $volts$ is induced in a given coil when the current in it changes at the rate of $48$ $amperes/ minute$. The self inductance of the coil is.....$henry$
→Identify the gate and match $A, B, Y$ in bracket to check
→A uniform magnetic field $B$ exists in a direction perpendicular to the plane of a square loop made of a metal wire. The wire has a diameter of $4\, mm$ and a total length of $30\, cm$ The magnetic field changes with time at a steady rate $dB / dt =0.032\, Ts ^{-1} .$ The induced current in the $100 p$ is close to $....A$
→(Resistivity of the metal wire is $\left.1.23 \times 10^{-8}\, \Omega m \right)$
This question has Statement $- 1$ and Statements $- 2$. Of the four choices given after the Statements, choose the one that best describes the two Statements
→Statement $-1$ : Out of radio waves and microwaves, the radio waves under go more diffraction
Statement $-2$ : Radio waves have greater frequency compared to microwaves
The radius of the Bohr orbit in the ground state of hydrogen atom is $0.5 Å.$ The radius of the orbit of the electron in the third excited state of $H{e^ + }$ will be......$ Å$
→$X-$ ray beam of intensity ${I_0}$ passes through an absorption plate of thickness $d$. If absorption coefficient of material of plate is $\mu $, the correct statement regarding the transmitted intensity $I$ of $X-$ ray is
→Given below are symbols for some logic gates The $XOR$ gate and $NOR$ gate respectively are
→A thin lens with focal length f to be used as magnifying glass. Which of the following statements regarding the situation is true?
The direction of ray of light incident on a concave mirror is shown by $PQ$ while directions in which the ray would travel after reflection is shown by four rays marked $1, 2, 3$ and $4 (Fig)$. Which of the four rays correctly shows the direction of reflected ray?
→An electric iron draws 5 amp, a TV set draws 3 amp and refrigerator draws 2 amp from a 220 volt main line. The three appliances are connected in parallel. If all the three are operating at the same time, the fuse used may be of