MCQ
The minimum wavelength of $X$-rays produced by electrons accelerated by a potential difference of volts is equal to
- A$\frac{e V}{h c}$
- B$\frac{e h}{c V}$
- ✓$\frac{h c}{e V}$
- D$\frac{c V}{e h}$
✓
Answer
Correct option: C.
$\frac{h c}{e V}$
$E=e V=h v_{\max }=\frac{h c}{\lambda_{\min }} \Rightarrow \lambda_{\min }=\frac{h c}{e V}$
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
For a compound microscope, the focal lengths of object lens and eye lens are $f_o$ and $f_e$ respectively, then magnification will be done by microscope when
→The ray diagram could be correct
Due to some force $F$ a body oscillates with period $4 / 5 sec$ and due to other force $F$ oscillates with period $3 / 5 sec$. If both forces act simultaneously, the new period will be
→The mutual inductance of an induction coil is $5 \mathrm{H}$. In the primary coil, the current reduces from $5 \mathrm{~A}$ to zero in $10^{-3} \mathrm{~s}$. What is the induced emf in the secondary coil
→A film of water is formed between two straight parallel wires of length $10 \mathrm{~cm}$ each separated by $0.5 \mathrm{~cm}$. If their separation is increased by $1 \mathrm{~mm}$ while still maintaining their parallelism, how much work will have to be done $\left(\right.$ Surface tension of water $=7.2 \times 10^{-2} \mathrm{~N} / \mathrm{m}$ )
→The Sl unit of momentum is
When a ferromagnetic material is heated to temperature above its Curie temperature, the material
A current carrying loop is placed in a uniform magnetic field. The torque acting on it does not depend upon
For adiabatic process, wrong statement is
The $X$-ray wavelength of $L_\alpha$ line of platinum $(\mathrm{Z}=78)$ is $1.30 \mathrm{~A}$. The $X$-ray wavelength of $L_\alpha$ line of Molybdenum $(\mathrm{Z}=42)$ is
→