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
A.
30.38 joule
V1 = 100 mL
V2 = 250 mL
Pressure P = 2 atm or 2 x 1.01 x 105 Nm-2
Work done by the' gas
W = PV or P (V2 - V1)
Put the value in given formula
W = 2 X 1.01 x 105 (0.250 x 10-3 -0.100 x 10-3)
= 2 x 1.01 x 105 x .15 x 10-3
= 30.38 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
How does the ionisation energy of 1st group elements vary ?
Increases down the group
Decreases down the group
Remains unchanged
Variation is not regular