Question

Energy from Sun is received on earth at the rate of . If average wavelength of solar light is taken as 550 nm, then how many photons are received on earth per meter2 per second? 

Solution

Correct option is

Energy received from the sun is  

       

Energy of 1 photon received from the sun is 

       

             

           

           

If the number of photons reaching the earth per meter2 per second be n, then their energy will be  joule. Thus 

        

  

 

SIMILAR QUESTIONS

Q1

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

Q2

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

Q3

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

Q4

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

Q5

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

Q6

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?  

Q7

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

Q8

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? 

     

Q9

 

In an accelerator experiment on high-energy collisions of the electrons with positrons, a certain event is interpreted as the annihilation of an electron-positron pair of total energy 10.2 BeV into two -rays of equal energy. Find the wavelength associated with each -ray. 

Q10

Monochromatic light of frequency  is produced by a laser. The power emitted is . What is the energy of a photon in the light beam?