Wave nature of electrons was demonstrated by :
Schrodinger
De-Broglie
Davisson and Garmer
Heisenberg
A gas can expand from 100 mL to 250 mL under a constant pressure of 2 atm .The work done by gas is :
30.38 joule
25 joule
5 k joule
16 joule
If the r.m.s. speed of a gaseous molecule is x m/sec at a pressure P atm , then what will be the r.m.s. speed at a pressure 2P atm and constant temperature ?
x
2x
4x
x/4
A.
x
r.m.s. speed of a gaseous molecule is x m/sec at a pressure P atm .
We know that in kinetic theory of gas ;
r.m.s. speed =
We know PV = RT
then r.m.s. speed =
As temperature is constant .So PV is constant .Hence , r.m.s. speed is also constant .If the pressure is doubled at constant temperature , there is no change in rm.s. speed .
How does the ionisation energy of 1st group elements vary ?
Increases down the group
Decreases down the group
Remains unchanged
Variation is not regular