Physics
(a) Name the principle on which a lever works.
(b) Which radiations that are emitted during the decay of a nucleus, having highest penetrating power?
(c) Does the emission of the above-mentioned radiation result in a change in the mass number?
Answer
(a) A lever works on the principle of moments, according to which in the equilibrium position of levers, moment of load about the fulcrum must be equal to the moment of effort about the fulcrum and the two moments must be in opposite directions.
(b) Gamma radiations emitted during the decay of a nucleus have the highest penetrating power.
(c) When gamma radiations are emitted from the nucleus then there is no change in mass number as gamma radiations have no charge and mass.
Related Questions
An endoscope uses optical fiber to transmit high resolution images of internal organs without loss of information. The phenomenon of light that governs the functioning of the optical fiber is:
- refraction
- reflection
- scattering
- total internal reflection
When a ray of light enters from a denser medium to a rarer medium then:
- the light ray bends towards the normal
- the speed of light increases
- the angle of incidence is greater than the angle of refraction
- its wavelength decreases.
A lever is shown below.
(a) Identify the type of lever.
(b) Calculate its mechanical advantage.
A metre rod made of copper and steel as shown in the diagram. Weights of copper and steel are 10 N and 8 N respectively.
(a) On which part does the centre of gravity lie (0 to 50 or 50 to 100).
(b) Justify your answer.
