MCQ
In a photon$-$particle collision, the quantity that does not remain conserved is:
- ATotal energy.
- BTotal momentum.
- ✓Number of photons.
- DNone of these.
✓
Answer
Correct option: C.
Number of photons.
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
Two identical charged spheres are suspended by strings of equal lengths. The strings make an angle $\theta$ with each other. When suspended in water the angle remains the same. If density of the material of the sphere is $1.5 \mathrm{~g} / \mathrm{cc}$, the dielectric constant of water will be
→(Take density of water $=1 \mathrm{~g} / \mathrm{cc}$ )
If a proton and electron have same de Broglie wavelength, then:
By photoelectric effect, Einstein, proved
A series $R-C$ circuit is connected to $AC$ voltage source. Consider two cases; $(A)$ when $C$ is without a dielectric medium and $(B)$ when $C$ is filled with dielectric of constant $4$ . The current $I_R$ through the resistor and voltage $V_C$ across the capacitor are compared in the two cases. Which of the following is/are true?
→$(A)$ $I_R^A > I_R^B$ $(B)$ $I_R^A < I_R^B$ $(C)$ $V_C^A > V_C^B$ $(D)$ $V_C^A < V_C^B$
In a photoelectric experiment ultraviolet light of wavelength $280\, {nm}$ is used with lithium cathode having work function $\phi=2.5\, {eV}$. If the wavelength of incident light is switched to $400\, {nm}$, find out the change in the stopping potential (in ${V}$).
→$\left({h}=6.63 \times 10^{-34}\, {J} \cdots\right.$, $\left.{c}=3 \times 10^{8} \,{ms}^{-1}\right)$
In an $AC$ generator, a coil with $N$ turns, all of the same area $A$ and total resistance $R$, rotates with frequency $\omega $ in a magnetic field $B$. The maximum value of $emf$ generated in the coil is
→If the refractive indices of a prism for red, yellow and violet colours be $1.61, 1.63$ and $1.65$ respectively, then the dispersive power of the prism will be
→A solid metal sphere of radius $R$ having charge $q$ is enclosed inside the concentric spherical shell of inner radius $a$ and outer radius $b$ as shown in figure. The approximate variation electric field $\overrightarrow{{E}}$ as a function of distance $r$ from centre $O$ is given by
→Current sensitivity of a moving coil galvanometer is $5\,div/mA$ and its voltage sensitivity (angular deflection per unit voltage applied) is $20\,div/V$. The resistance of the galvanometer is ................. $\Omega$
→Identify the wrong statement describing the color code for carbon resistors.