Ncert Exercises & Solutions

Precise measurements of physical quantities are a need of science. For example, to
ascertain the speed of an aircraft, one must have an accurate method to find its
positions at closely separated instants of time. This was the actual motivation behind
the discovery of radar in World War II. Think of different examples in modern science
where precise measurements of length, time, mass, etc. are needed. Also, wherever
you can, give a quantitative idea of the precision needed.

Extremely precise measurements are needed in modem science. As an example, while launching a satellite using a space launch rocket system we must measure time to a precision of 1 microsecond. Again working with lasers we require length measurements to an angstrom unit (1 A° = 10^-10m) or even a fraction of it. For estimating nuclear sizes we require a precision of 10^-15 m. To measure atomic masses using mass spectrograph we require a precision of 10^-30kg and so on.

NEET Information

courses

Company

Botany Questions

Chemistry Questions

Physics Questions

Zoology Questions