MCQ
Photoelectric effect shows :
- ✓Particle-like behavior of light
- BWave-like behavior of light
- CBoth wave-like and particle-like behavior of light
- DNeither wave-like nor particle-like behavior of light
The photoelectric effect supports the particle theory of light because it shows that the energy required to release electrons from a metal is totally dependent upon the frequency of the light, and not the intensity.
Therefore, certain frequencies of light, no matter how intense, cannot cause an electron to be emitted from the surface of a metal.
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$(A)$ $AgCN / KCN$
$(B)$ $RCOOAg / RCOOK$
$(C)$ $AgNO _{2} / KNO _{2}$
$(D)$ $AgI / KI$
$C (diamond) + O_2 \rightarrow CO_2(g)\ ;\Delta H =\ -97.6\ kcal$
$C (graphite) + O_2 \rightarrow CO_2(g)\ ;\Delta H =\ -94.3\ kcal$
The heat change for the conversion of $1\ g$ of $C (diamond) \rightarrow C (graphite)$ is