Question

Calculate the energy of a photon, in electron-volt (eV) and in watt-hour (W h), of wavelength 6600 Å. 

Solution

Correct option is

The energy of a photon of frequency v is hv. But , where c is the speed light and  is the wavelength of the photon. Hence the energy of the photon is given by 

          

                

              

.       

  

               = 1.875 eV. 

Again, 

            

              

              

              

SIMILAR QUESTIONS

Q1

An X-rays photon of wavelength  and frequency v collides with an electron and bounces off. If  are respectively the wavelength and frequency of the scattered photon, then

Q2

The binding energy of the innermost electron in tungsten is 40 keV. To produce characteristics X-rays using a tungsten target in an X-ray tube, the accelerating voltage should be greater than 

Q3

X-rays of wavelength  are incident normally on a crystal and the second order reflection on diffraction from the crystal observed at an angle of 45o. The lattice constant of the crystal is 

Q4

The frequency of  line of a source of atomic number Z is proportional to

Q5

A direct X-ray photograph of the intestines is not generally taken by the radiologists because :

Q6

X-rays which can penetrate through longer distance in substances are called.

Q7

The target in an X-rays tube should be a:

Q8

The maximum frequency of the X-rays produced in an X-ray tube

Q9

Which one of the following parameters of the emitted X-rays increases when the potential difference between the electrodes of an X-ray tube is increased?  

Q10

An X-rays tube produces a continuous spectrum of radiation with its short wavelength end at 0.45 Å. What is the maximum energy of a photon in the radiation? What is the order of accelerating voltage (for electrons) required in such a tube?