Brazil produced `2.5xx10^(6)` metric tonnes of coffee in an year and India produced `3.5xx10^(5)` metric tonnes of coffee the same year. Compare the quantities produced by the two countries .

The half-life period of U^(234) is 2.5 xx 10^(5) years. In how much is the quantity of the isotope reduce to 25% of the original amount?

Convert the following into specified units. (a) 10 years into hours (b) 15 metric tonnes into milligrams.

The concentration of hydronium ions in a cup of black coffee is 1.3 xx 10^(-5) M. What will be the pH of the coffee?

Find the product : {(-10)xx(-5)}xx6

Dissociation constant (K_a) of formic acid and acetic acid are 2.5xx10^-4 and 0.5xx10^-5 respectively. The ratio of their relative strengths at the same concentration is

A steel rod of length 25cm has a cross-sectional area of 0.8cm^(2) . The force required to stretch this rod by the same amount as the expansion produced by heating it through 10^(@)C is (alpha_(steel)=10^(-5)//^(@)C and Y_(steel)=2xx10^(10)N//m^(2))

Imagine that an electron revolves around a circle of the radius 5.3xx10^(-11)m with a linear speed of 7.5xx10^4 ms^(-1) in a hydrogen atom. The magnetic field produced at the centre of the circle, due to the electron, is

What sum of money lent at 6*5% per annum will produce the same interest in 4 years as Rs. 7,500 produce in 6 years at 5% per annum ?

Dal lake has water 8.2 xx 10^(12) litre approximately. A power reactor produces electricity at the rate of 1.5 xx 10^(6) colulomb per second at an appropriate voltage. How many years would it take to electrolyse the lake?

Multiply : 6.5xx10