Which of the following thermometers measures temperature from the thermal radiation emitted by objec

JAMB Physics 2023 56 views

Which of the following thermometers measures temperature from the thermal radiation emitted by objects?

  1. Thermocouple thermometer
  2. Pyrometer thermometer ✓
  3. Platinum resistance thermometer
  4. Constant pressure gas thermometer

Explanation

Momentum p = mv (mass × velocity). Impulse J = Ft = Δp (force × time = change in momentum). Same change in momentum can be achieved with large force for short time or small force for long time.

This is why: cars have crumple zones (extend collision time = reduce force), you bend knees when landing (extend time = reduce force on joints).

In collisions: elastic (KE conserved, objects bounce), inelastic (KE lost, objects may stick). Momentum is always conserved in closed systems.

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