Which of the following does not support the wave nature of light?

Explain Hertz's observation in short.

$A$ photocell is a device that:

The correct curve between the stopping potential $(V_0)$ and intensity of incident light $(I)$ is

$A$ photoelectric cell is illuminated by a point source of light $1 \ m$ away. When the source is shifted to $2 \ m$,then:

Consider the two following statements $A$ and $B$, and identify the correct choice given in the answers :
$(A)$ In photovoltaic cells, the photoelectric current produced is not proportional to the intensity of incident light.
$(B)$ In gas-filled photoemissive cells, the velocity of photoelectrons depends on the wavelength of the incident radiation.