- ✓Pressure
- BVolume
- CDensity
- DFlux
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$(A)$ The light ray enters air if $n _2= n _1$
$(B)$ The light ray is finally reflected back into the medium of refractive index $n_1$ if $n_2< n _1$
$(C)$ The light ray is finally reflected back into the medium of refractive index $n _1$ if $n _2> n _1$
$(D)$ The light ray is reflected back into the medium of refractive index $n_1$ if $n_2=1$


${ }_6^{11} C \rightarrow{ }_5^{11} B +e^{+}+ v _e+0.96 \,MeV$
Assume that, positrons $\left(e^{+}\right)$produced in the decay combine with free electrons in the atmosphere and annihilate each other almost immediately. Also, assume that the neutrinos $\left(v_e\right)$ are massless and do not interact with the environment. At $t=0$, we have $1 \mu g$ of ${ }_6^{12} C$. If the half-life of the decay process is $t_0$, the net energy produced between time $t=0$ and $t=2 t_0$, will be nearly ........... $MeV$