1 m=………… ly.

Fill in the blanks : (0 1 micron =…..m(ii)1 fermi=….m

Fill in the blanks by suitable conversions: 1 m = …light year

Name the series of hydrogen spectum lying in the infrared region.

Find the sum of all numbers lying between 1 and 100 which are divisible by 4 or 5.

Find the sum of all odd numbers lying between 12 and 90.

Determine the sum of the numbers lying between 100 and 500 which are divisible by 11.

Determine the sum of the numbers lying between 100 and 200 which are not divisible by 3.

In an A.P,if a_m=1/n and a_n=1/m then show that a_(nm)=1 .

How many numbers lying between 3000 and 6000 can be constructed by the digits 1,2,3,4,5,6 assuming that no digit is repeated in any number?

Let us assume that our galaxy consists of 2.5 xx 10^11 stars each of one solar mass. How long will a star at a distance of 50,000 ly from the galactic centre take to complete one revolution? Take the diameter of the Milky Way to be 10^5 ly.