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 ?