Question

calculate weve number of radiation having freqncy 4×10^12kHz​

Answer 1

λ=480nm=480×10  

−9

m       [∵1nm=10  

−9

m]

c=3×10  

8

m/sec

Frequency, v=  

λ

c

​  

=  

480×10  

−9

m

3×10  

8

ms  

−1

 

​  

=6.25×10  

14

s  

−1

 =6.25×10  

14

Hz.