Question

The wrong unit of conversion among the following is
1 angstrom = 10^-10 m
1 fermi = 10^-15 m
1 light year = 9.46 × 10^15 m
1 astronomical unit = 1.496 x 10^-11 m

Answer 1

Answer 1 astronomical unit= 1.496x10^-11m

A)1Angstrom: 1 Ångström is equal to0.1nanometers. Expressed in the SI base unit meters 1 Ångström is equal to 1×10

−10

meters. 1

A

˚

=0.0000000001m.

B)Definition of fermi unit: ≡1×10

−15

m.

C)The light-year is a unit of length used to express astronomical distances and measures about 9.46 trillion kilometres (9.46×10

12

km) or 5.88 trillion miles (5.88×10

12

mi).

D)The total radiation power received from the sun on a unit area perpendicular to the sun rays at the mean earth-sun distance, termed an astronomical unit, is called the solar constant (SC), where 1 astronomical unit =1AU=1.496×10

11

m.

So D is wrong unit conversion