Assertion : Photosensitivity of a metal is high if its work funct… - Vidyadip

MCQ

Assertion : Photosensitivity of a metal is high if its work function is small.
Reason : Work function = $\mathrm{hf}_0$ where $\mathrm{f}_0$ is the threshold frequency.

A
If both assertion and reason are true and the reason is the correct explanation of the assertion.
✓
If both assertion and reason are true but reason is not the correct explanation of the assertion.
C
If assertion is true but reason is false.
D
If the assertion and reason both are false.

✓

Answer

Correct option: B.

If both assertion and reason are true but reason is not the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Electron, Photon, Photoelectric Effect and X-Rays→Electron, Photon, Photoelectric Effect and X-Rays — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

The magnetic field lines due to a bar magnet are correctly shown in

The figure shows an isosceles triangle wire frame with apex angle equal to $\pi /2$. The frame starts entering into the region of uniform magnetic field $B$ with constant velocity $v$ at $t= 0$. The longest side of the frame is perpendicular to the direction of velocity. If $i$ is the instantaneous current through the frame then choose the alternative showing the correct variation of $i$ with time.

If the refractive index of a prism is $\sqrt{2}$ and the angle of refraction is $60^{\circ}$, then its minimum deviation angle will be :

According to classical theory, the circular path of an electron in Rutherford atom is

A transistor is operated in common emitter configuration at constant collector voltage $V_C= 1.5 \,V$ such that a change in the base current from $100\,\, \mu A$ to $150\, \mu A$ produces a change in the collector current from $5\,\, mA$ to $10\,\, mA$. The current gain $\beta$ is

There are three voltmeters of the same range but of resistances $10000\,\Omega $, $8000\,\Omega $ and $4000\,\Omega $ respectively. The best voltmeter among these is the one whose resistance is ................ $\Omega $

In a common base amplifier circuit, calculate the change in base current if that in the emitter current is $2\, mA$ and $\alpha = 0.98$.......$mA$

Let $I_A$ and $I_B$ be moments of inertia of a body about two axes $A$ and $B$ respectively. The axis $A$ passes through the centre of mass of the body but $B$ does not:

A heater is designed to operate with a power of $1000 \mathrm{~W}$ in a $100 \mathrm{~V}$ line. It is connected in combination with a resistance of $10 \Omega$ and a resistance $R$, to a $100 \mathrm{~V}$ mains as shown in figure. For the heater to operate at $62.5 \mathrm{~W}$, the value of $\mathrm{R}$ should be .................. $\Omega$.

An a.c. supply of $100$ volts is applied to a capacitor of capacitance $20 \mu F$. If the current in the circuit is $0.628$ A, the frequency of $a.c.$ must be.