Question

Assertion :   Photosensitivity of a metal is high if its work function is small.

Reason     : Work function =   where   is the threshold frequency.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) 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

(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

Similar questions

In image formation from spherical mirrors, only paraxial rays are considered because they:

Atomic radius of fcc is

(a)   

(b)

(c)

(d)

A fish looking up through the water sees the outside world contained in a circular horizon. If the refractive index of water is   and the fish is 12 cm below the surface, the radius of this circle in cm is

(a) 36 

(b) 4 

(c) 36 

(d) 36/ 

Two batteries, one of emf 18 volts and internal resistance 2Ω and the other of emf 12 volt and internal resistance 1 Ω, are connected as shown. The voltmeter V will record a reading of

(a) 15 volt

(b) 30 volt

(c) 14 volt

(d) 18 volt

According to classical theory, the path of an electron in Rutherford atomic model is:

Consider a parallel plate capacitor of 10 μF  (micro-farad) with air filled in the gap between the plates. Now one half of the space between the plates is filled with a dielectric of dielectric constant 4, as shown in the figure. The capacity of the capacitor changes to

(a) 25 μF  

(b) 20 μF

(c) 40 μF

(d) 5 μF

A moving coil galvanometer can be converted into voltmeter by:
The SI unit of electrical energy is ____________?

Doping of intrinsic semiconductor is done

(a) To neutralize charge carriers

(b) To increase the concentration of majority charge carriers

(c) To make it neutral before disposal

(d) To carry out further purification

A network of four capacitors of capacity equal to   and   are conducted in a battery as shown in the figure. The ratio of the charges on   and   is

(a)  

(b)  

(c)   

(d)