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A radio transmitter operates at a frequency 880 kHz and a power of 10 kW. The number of photons emitted per second is (a) 1.72 × 10 31 (b) 1.327 × 10 25 (c) 1.327 × 10 37 (d) 1.327 × 10 45



A radio transmitter operates at a frequency 880 kHz and a power of 10 kW. The number of photons emitted per second is


        (a)    1.72 × 1031        


(b)    1.327 × 1025


        (c)    1.327 × 1037


(d)    1.327 × 1045


Grade:10

3 Answers

Hrishant Goswami
343 Points
7 years ago

(a)

        No. of photons emitted per sec,

Mubashara Khan
15 Points
2 years ago
one kw is the power or energy per unit time 
1000j/s is the power (given that power = 10kw then 10kw =10000j/s)
we know that 
                  E=hf       
 where E= energy of a single photon 
            h= planck,s constant 
            f= frequency of the photon
now simplify equation as power = energy/sec
suppose n photons are emitted per second then we can say that 
power=nhf  
n=power/hf
n=10000/6.6 x 10-34 x880 x103
n=1.72 x 1031 
                             
ankit singh
askIITians Faculty 614 Points
one year ago
Electromagnetic Waves. A radio transmitter operates at a frequency of 880 kHz, and a power of 10 kW. Find the number of photons per second emitted. Suppose that the electric field amplitude of an electromagnetic wave is E0 = 120 N/C and that its frequency is v = 50.0 MHz.

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