Answer:
a=805714*10^2
b=1.2*10^18
Step-by-step explanation:
a) v=lf
Where l is wavelength sorry can't draw it
3*100000000=l*350000
L=8. 5714*10^2
b) v=lf
300000000=0.00000000025f
f=1.2*10^18
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