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NEET · Physics · Nuclei doubts
6 doubts found
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NEETPhysicshard
A sample has passed through three half-lives. Why is the amount left one-eighth, not zero?
A half-life removes the same fraction, not the same amount.
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NEETPhysicshard
How do I decide whether a nuclear reaction releases energy using atomic masses?
Calculate Q = (total initial mass - total final mass)c^2.
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NEETPhysicseasy
What does “Nuclear size and density” actually mean in Nuclei, and why does it matter for NEET?
Nuclear radius scales as R = R_0 A^(1/3), so volume scales with nucleon number A. Because mass also scales with A, nuclear density is approximately constant across nuclei.
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NEETPhysicsmedium
I keep getting “Nuclear size and density” questions wrong in Nuclei. What's the trap?
thinking a nucleus with twice the nucleons has twice the radius.
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NEETPhysicseasy
What does “Mass defect and binding energy” actually mean in Nuclei, and why does it matter for NEET?
A bound nucleus has less mass than its separated nucleons. The missing mass corresponds to the energy released during binding: B = Delta m c^2.
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NEETPhysicsmedium
I keep getting “Mass defect and binding energy” questions wrong in Nuclei. What's the trap?
subtracting masses in the wrong direction and obtaining negative binding energy.
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