1. (a) A student investigates what happens when light travels from air to glass. Figure 1 shows some of the apparatus used in the investigation. In Figure 1, angle Y is the angle of A deflection B incidence C reflection D refraction (iii) The student concludes that angle Y is directly proportional to angle X. Explain what the student must do to test this conclusion in more detail. (b) The speed of light is 3.0 × 10^8 m/s. The wavelength of yellow light is 5.8 × 10^-7 m. Calculate the frequency of yellow light. State the unit. Use the equation frequency = speed / wavelength

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1. (a) A student investigates what happens when light travels from air to glass - Edexcel - GCSE Physics: Combined Science - Question 1 - 2018 - Paper 1

Question 1

1. (a) A student investigates what happens when light travels from air to glass. Figure 1 shows some of the apparatus used in the investigation. In Figure 1, angle... show full transcript

Worked Solution & Example Answer:1. (a) A student investigates what happens when light travels from air to glass - Edexcel - GCSE Physics: Combined Science - Question 1 - 2018 - Paper 1

Step 1

In Figure 1, angle Y is the angle of

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Answer

The answer is C: reflection. This is because angle Y represents the angle at which light is reflected off the surface of the glass block.

Step 2

Explain what the student must do to test this conclusion in more detail.

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Answer

To test the conclusion that angle Y is directly proportional to angle X, the student should conduct a series of experiments by measuring angle Y for different values of angle X. The student should record the angles and plot the data on a graph. By observing whether a straight line is formed from the plotted points, the student can determine if there is a direct proportional relationship.

Step 3

Calculate the frequency of yellow light.

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Answer

We can calculate the frequency of yellow light using the formula:

frequency = \frac{speed}{wavelength}

Substituting the known values:

frequency = \frac{3.0 \times 10^8 \ m/s}{5.8 \times 10^{-7} \ m}

Calculating this gives:

frequency = 5.17 \times 10^{14} \ Hz

Rounding this to two significant figures yields:

frequency \approx 5.2 \times 10^{14} \ Hz

Step 4

State the unit.

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Answer

The unit of frequency is Hertz (Hz).

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