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Physics

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Explain the change of quark character associated with the beta-plus decay and deduce the equation.

First, we can deduce the equation for beta-plus decay in terms of the nucleons. We know a positron, ß⁺ (antilepton), is produced, so to conserve lepton number an electron neutrino, v_e<...

Answered by Thomas F. • Physics tutor

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Why does an ice skater spin faster when they hold in their arms?

This phenomena is a result of the conservation of angular momentum: An isolated system's rotational intertia does not change.

Angular momentum is given mathematically by
GL
Answered by George L. • Physics tutor
2474 Views
Two balls of mass 3kg and 7 kg respectively move towards one another with speeds 5ms^-1 and 2ms^-1 respectively on a smooth table. If they collide and join, what velocity do they move off with?
m = 3kg ; 7kg u = 5ms^-1 ; -2ms^-1 (Taking the direction to the right as positive). momentum before = m1u1 + m2u2 = (3x5) + (7x-2) = 1 momentum after = (m1+m2)v2 = (3+7)v = 10v By the principle of conserv...
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Answered by Aimee G. • Physics tutor
3236 Views
Find the angle at which total internal refraction takes place when light is going from glass to air.
The angle at which this takes place is called the critical angle.

We can apply Snell's law in this situation: n₁sin C1 = n₂sin (90deg)

sin C = n₂/ n
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Answered by Catherine T. • Physics tutor
1875 Views
Explain the photoelectric effect, when does it occur and what is its significance in understanding the nature of light ? (6)
metal (unlike insulators ) contains free electrons (1)

kinetic energy transferred from the light incident on the surface to the free electrons (1)

The maximum kinetic energy of the electrons...
HR
Answered by Helena R. • Physics tutor
1911 Views
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Top answers

Explain the change of quark character associated with the beta-plus decay and deduce the equation.

Why does an ice skater spin faster when they hold in their arms?

Two balls of mass 3kg and 7 kg respectively move towards one another with speeds 5ms^-1 and 2ms^-1 respectively on a smooth table. If they collide and join, what velocity do they move off with?

Find the angle at which total internal refraction takes place when light is going from glass to air.

Explain the photoelectric effect, when does it occur and what is its significance in understanding the nature of light ? (6)

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