solve the numericals

solve the numericals 10-2' ly unu of (a' time 'b' length wavelength oi light ot a SSOO A, Express nanomctve and q b) metre. The size of a bactena ts I g. Find the numtrr oi bactena in I m length. nk• distance of a galaxy from earth is 102-6 m. Assuming the speed of light to be IOS m s-l find time taken by light to travel this distance. Distance travelled [Hint : Tune taken speed 1-87 X S The wavelength of light is 589 nm. wavelength in Å ?

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