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Important Questions for NEB physics class 12 (3 Marks)

on April 30, 2024

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The solutions of the following questions can be found in our site.

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Why spin angular velocity of a star is greatly increased when it collapses under gravitational pull and becomes a neutron star?

Answer: While collapsing under gravitational pull, the size of the star decreases. Therefore, its moment of inertia decreases. As the angular momentum (L=I⍵) is conserved and I decreases, the spin angular velocity ⍵ is greatly increased.

Expressions for doppler effect's formula in different conditions.

Doppler Effect Formula Doppler effect is the apparent change in the frequency of waves due to the relative motion between the source of the sound and the observer. We can deduce the apparent frequency in the Doppler effect using the following equation: While there is only one Doppler effect equation, the above equation changes in different situations depending on the velocities of the observer or the source of the sound. Let us see below how we can use the equation of the Doppler effect in different situations. (a) Source Moving Towards the Observer at Rest In this case, the observer’s velocity is zero, so V 0 is equal to zero. Substituting this into the Doppler effect equation above, we get the equation of the Doppler effect when a source is moving towards an observer at rest as: (b) Source Moving Away from the Observer at Rest Since the velocity of the observer is zero, we can eliminate V 0 from the equation. But this time, the source moves away from the observer, s...

Important Questions for NEB physics class 12 (3 Marks)

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