Chapter U5, Problem 1STP

Interpretation Introduction

Interpretation:

The correct option for the energy as opposed to matter needs to be identified.

Concept introduction:

Matter is a substance which has some mass and it occupy space.Energy is the propertythat must be transfer from one form to another form but it neither be created nor destroyed.Example − heat energy, mechanical energy, light energy, etc.

According to Einstein Mass and energy are interconvertible.Any mass travels with speed of the light then it is converted into the energy.

Mathematically,this can be represented as:

$E=m{c}^2$

Answer to Problem 1STP

(D) light

Explanation of Solution

Reason for correct option:

Light is electromagnetic radiation energy. It travels $3\times {10}^{8}m/s$ in the space.

Light composed of photons or packets of energy and it is a mass. So, light have only energy but not mass then it can oppose any matter becauseit have high energy of photons.

Conclusion

Reasons for incorrect options:

(A) Safety match: Safety match blown easily after rubbing of phosphorous with the potassium chlorate on the match head. So it creates heat energy after rubbing to initiate combustion. It has not sufficient capacity to oppose a matter because it ignites for a short life span.

(B) Potassium chlorate,KCIO₃( s ):It is a matter it have mass 122.55 g/mol. This is not energy but it is a matter because it has the mass and it is a solid substance in pure form.

(C) Fireworks: Fireworks are the low explosive material. The bright sparkles in fireworks come from the burning of small tiny fragment of metal. It ignites for a small time so it has also not so much energy to oppose the matter.