$\text{p}=0,\text{ E}\neq0$
$\text{p}\neq0,\text{ E}=0$
$\text{p}\neq0,\text{ E}\neq0$
$\text{p}=0,\text{ E}=0$
Explanation:
When an electromagnetic wave strikes a material surface, it transports the momentum, as well as the energy, to the surface. The striking electromagnetic wave exerts pressure on the surface. The total energy transferred to the surface by the electromagnetic wave is given by $\text{E}=\text{pc}$ Therefore, $\text{p}\neq0,\text{ E}\neq0$
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(a) |
(b) |
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(c) |
(d) |
The ratio of minimum to maximum wavelength in Balmer series is
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(a) 5 : 9 |
(b) 5 : 36 |
(c) 1 : 4 |
(d) 3 : 4 |
The grid voltage of any triode valve is changed from –1 volt to – 3 volt and the mutual conductance is 3 
mho. The change in plate circuit current will be
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(a) 0.8 mA |
(b) 0.6 mA |
(c) 0.4 mA |
(d) 1 mA |
In a hypothetical Bohr hydrogen, the mass of the electron is doubled. The energy 
and the radius 
of the first orbit will be (
is the Bohr radius)
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(a) |
(b) |
|
(c) |
(d) |
Magnetic field intensity at the centre of coil of 50 turns, radius 0.5 m and carrying a current of 2 A is
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(a) 0.5 |
(b) 1.25 |
(c) 3 |
(d) 4 |
Compton effect shows that
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(a) X-rays are waves |
(b) X-rays have high energy |
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(c) X-rays can penetrate matter |
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