- AThey have the same particles in the nucleus.
- BThey are equally abundant in nature.
- CThey have the same number of protons
- DThey have the same mass.
Explanation:
Isotopes of the same element must have same number of protons but different number of neutrons and hence they have different mass.
Also the isotopes of same element are not equally abundant in nature.
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According to the Rutherford’s atomic model, the electrons inside the atom are
|
(a) Stationary |
(b) Not stationary |
(c) Centralized |
(d) None of these |
Assertion : At a point in space, the electric field points towards north. In the region, surrounding this point the rate of change of potential will be zero along the east and west.
Reason : Electric field due to a charge is the space around the charge.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
The spectrum of radiation 1.0
is in the infrared region. The energy of one photon of this in joules will be
|
(a) 6.62 |
(b) 6.62 |
(c) |
(d) 3 |
Radio wave diffract around building although light waves do not. The reason is that radio waves
|
(a) Travel with speed larger than c |
(b) Have much larger wavelength than light |
|
(c) Carry news |
(d) Are not electromagnetic waves |
When light rays are incident on a prism at an angle of 45°, the minimum deviation is obtained. If refractive index of the material of prism is , then the angle of prism will be
|
(a) 30° |
(b) 40° |
(c) 50° |
(d) 60° |