What will be the angular width of central maxima in Fraunhoffer diffraction when light of wavelength 6000 
is used and slit width is 12
|
(a) 2 rad |
(b) 3 rad |
(c) 1 rad |
(d) 8 rad |
(c) 1 rad
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An electron beam in an X-ray tube is accelerated through a potential difference of 50000 volts. These are then made to fall on a tungsten target. The shortest wavelength of the X-ray emitted by the tube is
| (a) 2.5 Å | (b) 0.25 nm | (c) 0.25 cm | (d) 0.025 nm |
A hydrogen like atom of atomic number Z is in an excited state of quantum number 2n. It can emit a maximum energy photon of 204 eV. If it makes a transition to quantum state n, a photon of energy 40.8 eV is emitted. The value of n will be
|
(a) 1 |
(b) 2 |
(c) 3 |
(d) 4 |
When a magnetic field is applied in a direction perpendicular to the direction of cathode rays, then their
|
(a) Energy decreases |
|
(b) Energy increases |
|
(c) Momentum increases |
|
(d) Momentum and energy remain unchanged |
The resistivity of a wire
|
(a) Increases with the length of the wire |
|
(b) Decreases with the area of cross-section |
|
(c) Decreases with the length and increases with the cross-section of wire |
|
(d) None of the above statement is correct |