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

The correct symbol for zener diode is

(a)

(b)

(c)

(d)

The $\mu_0$ is also known as :

Equivalent resistance between the points A and B is (in W)

(a)   

(b) 1 

(c) 2 

(d) 3 

Assertion  :   De-morgan's theorem   may be explained by the following circuit

Reason  :  In the following circuit, for output inputs ABC are 101

(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.

The capacitance of a parallel plate capacitor is 12μF. If the distance between the plates is doubled and area is halved, then new capacitance will be

(a) 8μF    

(b) 6μF

(c) 4μF    

(d) 3μF

Line spectrum contains information about

(a) The atoms of the prism

(b) The atoms of the source

(c) The molecules of the source

(d) The atoms as well as molecules of the source

Which of the following spectral series in hydrogen atom give spectral line of 4860 Å

(a) Lyman

(b) Balmer

(c) Paschen

(d) Brackett

Green light of wavelength 5460 $\stackrel{\circ}{A}$ is incident on an air-glass interface. If the refractive index of glass is 1⋅ 5, the wavelength of light in glass would be (Given that the velocity of light in air, $c =3 \times 10^8 m s ^{-1}$ )

If critical angle for a material to air is 30o, the refractive index of the material will be

(a) 1.0

(b) 1.5

(c) 2.0      

(d) 2.5