The Hindu (Mumbai)

# Little things that punch above their weight

- Vasudevan Mukunth

## QUESTION 1

Isolate an atom of the carbon12 isotope and make sure it is in its ground state (i.e. not excited) and not in motion. Measure its mass. This amount of mass is called the atomic mass constant.

What other name does it go by?

## XQUESTION 2

An important way to classify subatomic particles is as fundamenta­l versus composite particles. Fundamenta­l particles are not made up of smaller particles whereas composite particles are. Name the heaviest known fundamenta­l particle. It was discovered in 1995.

## XQUESTION 3 The massenergy equivalenc­e is often

described by the formula E = mc2 (where is the speed of light). According to this equation, one _____ of energy is equivalent to 1.1 x 1017 kg of mass. Fill in the blank with a unit of energy.

## XQUESTION 4

In 1966, some physicists proposed that right after the universe formed in the Big Bang, some small clumps of subatomic particles could have resulted in the formation of primordial _____ _____. The lightest these objects could have been is about 0.00000001 kg. Fill in the blanks.

## XcQUESTION 5

gravitatio­nal waves suggest this should be no more than 7.7 x 1023 eV/c2. Name X.

## Answers to February 20 quiz:

1. Field of study Boltzmann is famous for developing – Ans: Statistica­l mechanics

## 2. Formula inscribed on Boltzmann’s tombstone –

Ans: Entropy 3. Woman whose appeal to audit mathematic­s lectures Boltzmann supported – Ans: Henriette von Aigentler

4. Physicist who named constant in entropy formula for Boltzmann – Ans: Max Planck

5. French physicist who worked out the value of the Boltzmann constant – Jean Perrin

Ernst Mach