If threshold wavelength for sodium is 6800Å then the work functio… - Vidyadip

Question

If threshold wavelength for sodium is 6800Å then the work function will be(a) 1.8 eV (b) 2.5 eV(c) 2.1 eV (d) 1.4 eV

✓

Answer

(a) 1.8 eV

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→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

The particles which can be added to the nucleus of an atom without changing its chemical properties are called(a) Electrons(b) Protons(c) Neutrons(d) None of the above

$Q$ value for neutron decay is:

The reason of current flow in P-N junction in forward bias is(a) Drifting of charge carriers(b) Minority charge carriers(c) Diffusion of charge carriers(d) All of these

On a glass plate a light wave is incident at an angle of $60^\circ .$ If the reflected and the refracted waves are mutually perpendicular, the refractive index of material is

An antenna is a device (a) That converts electromagnetic energy into radio frequency signal(b) That converts radio frequency signal into electromagnetic energy(c) That converts guided electromagnetic waves into free space electromagnetic waves and vice-versa(d) None of these

A graph is plotted between the potential difference (applied across the ends of a conductor) and the current (following through the conductor). The graph is a straight line

A heating coil can heat the water of a vessel from 20℃ to 60℃ in 30 minutes. Two such heating coils are put in series and then used to heat the same amount of water through the same temperature range. The time taken now will be (neglecting thermal capacity of the coils)(a) 60 minutes(b) 30 minutes
(c) 15 minutes(d) 7.5 minutes

Two resistors $A$ and $B$ have resistances $R_A$ and $R_B,$ respectively, and $R_A < R_B.$ The resistivities of their materials are $\rho _{\text{A}}$ and $\rho_{\text{B}}.$

A particle of mass $m$ and charged $q$ is accelerated through a potential V. The de-Broglie wavelength of the particle will be :

The diameter of objective of a telescope is $1m.$ Its resolving limit for the light of wavelength $4538\mathring{\text{A}}$, will be$:$