IB Physics SL S1.1 Experimental Techniques Topic Practice

This question is about mobile phones.

The number of mobile phones has grown rapidly in recent years. Discuss environmental issues associated with this rapid increase.

A group of students uses pressurized air to move a piston that forces a nail into a block of wood. A gauge is used to measure the pressure P of compressed air above atmospheric pressure. The nail enters the wood perpendicular to its surface.

The students use a ruler to measure the length of the nail which remains above the surface of the wood as shown. The depth of the nail inside the wood is d. All necessary length measurements are recorded using a ruler with uncertainty $\pm 1 \mathrm{~mm}$.

A group of students is investigating refraction in a semi-circular glass block.

Light from a ray box enters the curved side of the block. The light passes through the block and leaves, refracted, at P .

The students vary the position of the ray box to obtain data to determine the refractive index of the glass. They use a protractor to collect values for the angles of incidence $\theta_{i}$ and refraction $\theta_{r}$ at P and record them on a table.

One of their measurements is shown. State $\theta_{r}$ for this measurement.