ESAT ESAT Physics 3

Question 1

What is the half-life concept in radioactive decay as tested in ESAT?

Accepted Answer

Time for half the nuclei to decay

Answer

Half-life is the time taken for half the radioactive nuclei in a sample to undergo decay.

Question 2

Which type of electromagnetic radiation has the highest frequency?

Accepted Answer

Gamma rays

Answer

Gamma rays occupy the highest-frequency (and highest-energy) end of the electromagnetic spectrum.

Question 3

A projectile is launched horizontally from a cliff. Which quantity remains constant throughout its flight (ignoring air resistance)?

Accepted Answer

Horizontal velocity

Answer

With no air resistance, the horizontal velocity is unchanged because no horizontal force acts on the projectile.

Question 4

What does Faraday's law of electromagnetic induction state?

Accepted Answer

EMF is proportional to the rate of change of magnetic flux

Answer

Faraday's law states that induced EMF = -dΦ/dt, where Φ is the magnetic flux.

Question 5

In ESAT Physics, what is the principle of superposition for waves?

Accepted Answer

The resultant displacement is the sum of individual displacements

Answer

Superposition states that when two or more waves overlap, the total displacement equals the algebraic sum of individual displacements.

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