According to Rutherford's model, where is most of the mass of an atom concentrated?
Nucleus
In Rutherford's nuclear model of the atom (1911), the α-particle scattering experiment showed that almost all the mass of an atom is concentrated in a tiny, dense, positively charged region called the nucleus.
Electrons, having negligible mass compared with protons and neutrons, revolve around this nucleus in the vast empty space of the atom. The 'electron cloud' is a later quantum-mechanical concept, and 'proton shell' and 'orbitals' do not describe where mass sits.
Hence, Nucleus.
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Important Questions from Physics
What is the colour of the light emitted by the Sun?
Lightning occur in the sky when two clouds:
With reference to street-lighting, how do sodium lamps differ from LED lamps?
1. Sodium lamps produce light in 360 degrees but it is not so in the case of LED lamps.
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3. The spectrum of visible light from sodium lamps is almost monochromatic while LED lamps offer significant colour advantages in street lighting.
Select the correct answer using the code given below.
Which one of the following is a reason why astronomical distances are measured in light-years?
In a pressure cooker, the temperature at which the food is cooked depends mainly upon which of the following?
1. Area of the hole in the lid
2. Temperature of the flame
3. Weight of the lid
Select the correct answer using the code given below.
