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A 100 watt sodium lamp is radiating light of wavelength 7960 Angstrom uniformly in all directions. Q1. At what rate photons are emitted from the lamp? A) B) C) D) Q2. At what distance from the lamp,the average flux is 1 photon/cm 2 s? A) 10 4 m B)10 5 m C) 10 7 m D) 10 8 m Q3. At what distance the average density is 1 photon/cm 3 ? A) B) C) D)


 A 100  watt sodium lamp is radiating light of wavelength 7960 Angstrom  uniformly in all directions.

Q1. At what rate photons are emitted from the lamp?

 

A)   B)  C) D)

 

Q2. At what distance from the lamp,the average flux is 1 photon/cm2 s?

 

A) 104 m   B)105 m C) 107 m D) 108 m

 

Q3. At what distance the average density is 1 photon/cm3 ?

 

A)

B)

C)

D)


Grade:upto college level

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