When a current of 1 ampere is passed through a conductor whose ends are maintained at temperature difference of 1 ℃, the amount of heat evolved or absorbed is called
|
(a) Peltier coefficient |
(b) Thomson coefficient |
|
(c) Thermoelectic power |
(d) Thermo e.m.f. |
(b) Thomson coefficient
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Electromagnetic waves travel in a medium which has relative permeability 1.3 and relative permittivity 2.14. Then the speed of the electromagnetic wave in the medium will be
|
(a) 13.6 |
(b) 1.8 |
(c) 3.6 |
(d) 1.8 |
The wavelength Ka X-rays produced by an X-ray tube is 0.76 Å. The atomic number of anticathode material is
|
(a) 82 |
(b) 41 |
(c) 20 |
(d) 10 |
Refractive index of glass is 
and refractive index of water is 
. If the speed of light in glass is 2.00 
m/s, the speed in water will be
|
(a) 2.67 |
(b) 2.25 |
(c) 1.78 |
(d) 1.50 |
An electron is travelling along the x-direction. It encounters a magnetic field in the y-direction. Its subsequent motion will be
|
(a) Straight line along the x-direction |
(b) A circle in the xz-plane |
|
(c) A circle in the yz-plane |
(d) A circle in the xy-plane |
$\overrightarrow{\text{F}}\times\overrightarrow{\text{a}}$
$\overrightarrow{\text{v}}\times\overrightarrow{\text{r}}$
$\overrightarrow{\text{a}}\times\overrightarrow{\text{r}}$
$\overrightarrow{\text{F}}\times\overrightarrow{\text{r}}$
The stopping potential (
|
(a) Depends upon the angle of incident light |
|
(b) Depends upon the intensity of incident light |
|
(c) Depends upon the surface nature of the substance |
|
(d) Is independent of the intensity of the incident light |
