Physics 9702/23 — October/November 2020

Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme

questions

marks

minutes

Topics Physical Quantities and Units · Waves · Dynamics · Forces, Density and Pressure · Kinematics · Deformation of Solids · +6 more

Q1Physical Quantities and UnitsWavesFree sample

Answer all the questions in the spaces provided.

(a)

An electromagnetic wave has a wavelength of $85\ \mu\text{m}$ .

(i)

State the wavelength, in m, of the wave.

wavelength = ______ $\text{m}$

(ii)

Calculate the frequency, in THz, of the wave.

frequency = ______ $\text{THz}$

(iii)

State the name of the region of the electromagnetic spectrum that contains this wave.

(b)

The current $I$ in a coil of wire produces a magnetic field. The energy $E$ stored in the magnetic field is given by

E = \frac{I^2 L}{2}

where $L$ is a constant.

The manufacturer of the coil states that the value of $L$ , in SI base units, is $7.5 \times 10^{-6} \pm 5\%$ .
The current $I$ in the coil is measured as $(0.50 \pm 0.02)\ \text{A}$ .

The values of $L$ and $I$ are used to calculate $E$ .

Determine the percentage uncertainty in the value of $E$ .

percentage uncertainty = ______ $\%$

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6 more questions

Q2Forces, Density and Pressure · Physical Quantities and Units · Dynamics6M
Q3Kinematics · Dynamics10M
Q4Deformation of Solids · Work, Energy and Power12M
Q5Waves · Superposition9M
Q6Electricity · D.C. Circuits10M
Q7Electric Fields · Particle Physics7M

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