IB Physics HL A 3 1 Conservation of Energy Questions

Practise analysing HL conservation-of-energy questions involving energy-transfer chains, radiation and thermal losses, wind-turbine power limits and quantitative changes.

Exam points

Apply the principle of conservation of energy to account for energy transfers between stores in a closed system.
Track useful, dissipated and transferred energy quantitatively using complete mark-scheme evidence and consistent units.

[Maximum number: 1]

Two sources of light produce an interference pattern on a screen.

Light of wavelength 720 nm is incident on two narrow slits that are separated by 0.12 mm . An interference pattern is observed on a screen. $\mathrm{P}_{1}$ and $\mathrm{P}_{2}$ are the points of destructive interference closest to the central maximum M .

Figure for Question IB Physics HL A 3 1 Conservation of Energy Questions question 1 — IB Physics HL

Suggest how energy conservation is consistent with the fact that the energy at $\mathrm{P}_{1}$ and $\mathrm{P}_{2}$ is zero.

A beam of light containing all wavelengths in the range $[550 \mathrm{~nm}, 650 \mathrm{~nm}]$ is incident normally on a diffraction grating. The grating has 580 lines per mm . A diffraction pattern is observed on a screen as shown.

The energy missing at $\mathrm{P}_{1}$ and $\mathrm{P}_{2}$ is found at the maxima

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IB Physics HL A 3 1 Conservation of Energy Questions question 1