Question

The graph of kinetic energy against the frequency v of incident light is as shown in the figure. The slope of the graph and intercept on X-axis respectively are ______.

पर्याय

• maximum KE threshold frequency

• Planck's constant, threshold frequency

• Planck's constant, work function

• work function, maximum KE

Answer 1

The graph of kinetic energy against the frequency v of incident light is as shown in the figure. The slope of the graph and intercept on X-axis respectively are planck's constant, threshold frequency.

Explanation:

For photoelectric effect,

(KE)_max =h_v - Φ₀   ...(i)

where Φ₀ is the work function of metal.

On comparing the Eq. (i) with straight line equation

y = mx + c, we get

Slope, m = h and intercept on y, c = - Φ₀  and Φ₀ = hv₀
where, v₀ is threshold frequency.
So, for the graph of kinetic energy (KE) against the frequency (v).
Slope = Planck's constant
and intercept on X-axis = threshold frequency