CBSE
A golf-ball weigh 40.0 gm. If it is moving with a velocity of 20.0 ms-1, it's de-Broglie wavelength is
1.66 x 10-34 nm
8.28 x 10-32 nm
8.28 x 10-25 nm
1.66 x 10-24 nm
Dual nature of particle was-given by
Bohr theory
Thomson model
Heisenberg principle
de-Broglie equation
Which of the following order of ionisation energy is correct?
B < Be < N < C
Be > B > C > N
B < Be < C < N
Be < B < C < N
Consider the following pairs of ions:
I. Sc3+ and Ti4+ II. Mn2+ and Fe2+
III. Fe2+ and Co3+ IV. Cu+ and Zn2+
Among these pairs ofions, isoelectronic pairs would include:
II, III and IV
I, III and IV
I, II and IV
I, II and III
India conducted an underground nuclear test at
Narora
Tarapur
Pushkar
Pokharan
The line spectrum of He+ ion will resemble that of :
hydrogen atom
Li+ ion
helium atom
lithium atom
An element 'Y' emits one -and two - particles to give 'X'. X and Y are
isotones
isobars
isotopes
isoelectronics
A body of mass x kg is moving with a velocity of 100 ms-1. Its de-Broglie wavelength is 6.62 x 10-35 m. Hence, x is :
[h = 6.62 x 10-34Js]
0.1 Kg
0.25 Kg
0.15 Kg
0.2 Kg
Which is the shortest wavelength line in the Lyman series of the hydrogen spectrum? (R= 1.097 x 10-2 nm-1)
94.21 nm
91.16 nm
911.6 nm
933.6 nm
Ratio of radii of second and first Bohr orbits of H atom is
2
4
3
5