CBSE
Match the particle with its characteristic
Column I | Column II |
A. -particle | p. Slow moving |
B. Isobar | q. High penetration power |
C. - ray | r. Same atomic mass |
D. - particle | s. consists of electron |
A - p; B - r; C - q; D - s
A - p; B - q; C - r; D - s
A - r; B - s; C - p; D - q
A - s; B - r; C - p; D - q
Which one of the following sets of quantum numbers represents the highest energy level in an atom?
n = 4; l = 0; m = 0; s = +
n = 3; l = 1; m = 1; s = +
n = 3; l = 2; m = -2; s = +
n = 3; l = 0; m = 0; s = +
The ratio of the difference in energy between the first and the second Bohr orbit to that between the second and the third Bohr orbit is
If n = 6, the correct sequence for filling of electrons will be
ns (n - 1)d (n - 2)f np
ns (n - 2)f np (n - 1)d
ns np (n - 1)d (n - 2)f
ns (n - 2)f (n - 1)d np
In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainty with which the position of the electron can be located is
(Given, h= 6.6 x 10-34 kg m2 s-1, mass of electron em = 9.1 x 10-31 kg)
215 x 10-3 m
2.78 x 10-3 m
1.92 x 10-3 m
3.24 x 10-3 m
What will be the number of waves formed by a Bohr electron in one complete revolution in its second orbit?
Three
Two
One
Zero
The Vividh Bharti Station of All India Radio, Delhi, broadcasts on a frequency of 1,368 kHz (Kilohertz). Calculate the wavelength () of the electromagnetic radiation emitted by transmitter. Which part of the electromagnetic spectrum does it belong to?
319.4 m and X-rays
319.4 m and radiowave
219.3 m and microwave
219.3 m and radiowave
An electron is moving in Bohr's fourth orbit. Its de-Broglie wave length is . What is the circumference of the fourth orbit?
2
4
Maximum number of electrons in a subshell of an atom determined by the following?
4l + 2
2n2
4l - 2
2l + 1
Highest energy will be absorbed to eject out the electron in the configuration.
1s22s22p1
1s22s22p3
1s22s22p2
1s22s22p4