In hydrogen atom, the electron makes 6.6 
revolutions per second around the nucleus in an orbit of radius 0.5 
. It is equivalent to a current nearly
|
(a) 1 A |
(b) 1 mA |
(c) 1 μA |
(d) 1.6 |
(b) 1 mA
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The distance between the focus and the pole of the mirror is called:
A conducting ring is placed around the core of an electromagnet as shown in fig. When key K is pressed, the ring
|
(a) Remain stationary |
|
(b) Is attracted towards the electromagnet |
|
(c) Jumps out of the core |
|
(d) None of the above |
According to Einstein’s photoelectric equation, the plot of the kinetic energy of the emitted photo electrons from a metal versus the frequency, of the incident radiation gives a straight line whose slope
|
(a) Is the same for all metals and independent of the intensity of the radiation |
|
(b) Depends on the intensity of the radiation |
|
(c) Depends both on the intensity of the radiation and the metal used |
|
(d) Depends on the nature of the metals used |
The ionisation energy of hydrogen atom is 13.6 eV. Following Bohr's theory, the energy corresponding to a transition between the 3rd and the 4th orbit is
|
(a) 3.40 eV |
(b) 1.51 eV |
(c) 0.85 eV |
(d) 0.66 eV |
50 Ω and 100 Ω resistors are connected in series. This connection is connected with a battery of 2.4 volts. When a voltmeter of 100 Ω resistance is connected across 100 Ω resistor, then the reading of the voltmeter will be
|
(a) 1.6 V |
(b) 1.0 V |
(c) 1.2 V |
(d) 2.0 V |
In a two slit experiment with monochromatic light fringes are obtained on a screen placed at some distance from the sits. If the screen is moved by 5 
towards the slits, the change in fringe width is 3 
. If separation between the slits is 
, the wavelength of light used is
|
(a) 6000 Å |
(b) 5000 Å |
(c) 3000 Å |
(d) 4500 Å |
