Question

The work function of a sulsstance is 4.0ev the longest wavelength of light that can cause photoelectron emission from this sulsstance is opprinately.

Solution

Correct option is

310 nm

    

        

        .

SIMILAR QUESTIONS

Q1

Monochromatic radiation of wavelength 640.2 nm (1 nm = 10–9m) from a neon lamp irradiates a photosensitive material made of cesium or tungsten. The stopping voltage is measured to be 0.54 V. The neon surface is replaced by an iron source whose 427.2 nm line irradiates the material. Predict the new stopping voltage. 

Q2

The first emission line in the atomic spectrum in the Ballmer series appears at:

Q3

A 200g rickets ball is thrown with a speed of 3 cm/sec. what will be its de Broglie Wavelength

Q4

If the X-rays tulie is working at 20kv. Then the minimum wavelentgth of X – rays will be.

Q5

An X – rays tulie is operating at 15kv. The lower limit of the wavelength of X – rays produced is:

Q6

The lattice constant of a crystal is 2.   the manimum wavelength of X – rays which can ba analysed by this arystal will be.

Q7

The frequency of the line k line of the characteristtis X – rays spectrum is proportional to.

Q8

50% of  X – rays oltained from a Coolidge tukie pass through 0.3mm thick  alminium  fail. If the P.D. letueen thew target and the cathode is increased.then the fractuion of X – rays passing from fail will be.

Q9

The threshold wavelength of sodiam  metal is 6800the work function is:

Q10

Potential energy of li2t electron is