Question

According to Einstein's interpretation of the photo-electric effect, the maximum $KE$ of photoelectric depends on $(hv-W)$ where $v$ is the frequency incident radiation and W in the work function. For three difference metals a graph is plotted between maximum $KE$ and the frequency of incident radiations. The three graphs obtained

• A. Have different slopes but a constant intercept on $y-axis$
• B. Are all parallel to $y-axis$ is but at different heights
• C. Same slope but different intercepts on $y-axis$
• D. None of the above

Answer 1

The correct option is C Same slope but different intercepts on $y-axis$

$KE=hv-W$
W is the property of material
for three different metals A, B and C
$K{E}_A=hv-W_A$
$K{E}_B=hv-W_B$
$K{E}_C=hv-W_C$
Slope = $h$
$y-intercept=W$