The variation of the stopping potential ( $\mathrm{V}_{\mathrm{o}}$ ) with the frequency of incident radiation( $n$ ) is as given below.
[no - threshold frequency. h - Planck's constant e-electronic charge] then the slope of the graph AB with the frequency axis is:

$\frac{h}{e}$
$\frac{h n_0}{V_0}$
$\frac{n_0}{V_0}$
$$ \frac{V_0}{n_0} $$
An object placed 40 cm in front of a thin convex lens is moved to 60 cm from the lens. If the focal length of the lens is 30 cm the ratio of magnification of the image at the initial position to the final position is:
$3: 2$
$2: 3$
$1: 3$
$3: 1$
The voltage - current graph for a metal wire of uniform area of cross section at two different temp $T$ and $T^{\prime}$ is shown.
Then choose the correct statement:

Resistivity is independent of temperature
Resistance of the conductor at temperature T is greater than resistance of the conductor at temperature $\mathrm{T}^{\prime}$
Temperature $\mathrm{T}^{\prime}$ is greater than temperature T
Temperature T is greater than temperature $\mathrm{T}^{\prime}$
An electronic device operates at 2 MHz . The oscillating circuit has an inductance $20 \times 10^{-5} \mathrm{H}$. What is the capacitive reactance of the resonant circuit?
$251.2 \Omega$
$2512 \Omega$
$1256 \Omega$
$5024 \Omega$
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