The heat energy obtained on burning 2 kg of hydrogen,coal and petrol are given below : Petrol -9 xx 10^7 j ,Hydrogen - 3 xx 10^8 j , Coal -6 xx 10^7 j
Which of these is the most efficient fuel?

The heat energy obtained on burning 2 kg of hydrogen,coal and petrol are given below : Petrol -9 xx 10^7 j ,Hydrogen - 3 xx 10^8 j , Coal -6 xx 10^7 j Arrange these fuels in the ascending order of their calorific values.

The heat energy obtained on burning 2 kg of hydrogen,coal and petrol are given below : Petrol -9 xx 10^7 j ,Hydrogen - 3 xx 10^8 j , Coal -6 xx 10^7 j How much is the calorific value of hydrogen?

The magnetic field of a plane electromagnetic wave is given by B= 2 xx 10^-7 sin (0.5 xx 10^3 x +1.5 x 10^11 t) : What is wave length and frequency?

The electron energy for the quantum number n = 2 in a hydrogen atom is Given, m =9.1xx10^(-31)"kg",e=1.6xx10^(-19) C,h =6.6xx10^(-34)"kgm"^(2)s^(-1)

Find the height of mountain from the data given below. Maximum shearing stress = 30xx10^7N/m^2 , Density of material of mountain= 3xx10^3kg*m^-3