An electromagnetic wave with a frequency of 7.57 x 1014 hz will have a wavelength of 3.96 x 10-7 m. t/f

Wavelength  is  equal  to  c/f  =3.96  x10^-7m.t/f  where  c   is  the  speed  of  light  and  F is  the  frquency
f(frequency  of  the  wave)=7.57  x 10^14  Hz
c(speed  of  light  is  always=3 x10^8m/s
wavelenth is   therefore={(3x 10^8  )/(7.57 x10^14)}  =0.396  x 10^-6=3.96  x  10^-7  (true)

The flowers in a flower arrangement are actually alive