GCSE|Edexcel|Physics P1H (Nov 2021)

This question is about ultrasound.

Which of these is a frequency of ultrasound?

• 2.3 Hz

• 23 Hz

• 23 kHz

• 2.3 kHz

Ultrasound has many uses.

One device called a pest repeller emits ultrasound.

The ultrasound keeps mice out of the garden.

Explain why the device affects mice but does not affect humans.

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A technician has a different ultrasound device.

This device can emit and detect short pulses of ultrasound.

The device can also measure the time, in ms, from emitting a pulse to

detecting the same pulse.

Describe how the technician can use this device to determine the speed of

ultrasound in air.

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Figure 1 shows part of a wave.

Use data from Figure 1 to calculate the wavelength of the wave.

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The speed of a water wave is 1.5m/s.

The frequency of the wave is 0.70Hz.

Calculate the wavelength of this wave.

Use the equation: v = f × λ

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Water waves are transverse waves.

Describe the difference between transverse waves and longitudinal waves.

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This question is about radioactivity.

Alpha (α), beta (β) and gamma (γ) are three types of radioactive emissions.

Which statement describes all of these radioactive emissions?

• ionising and emitted by stable nuclei

• ionising and emitted by unstable nuclei

• neutral and emitted by stable nuclei

• neutral and emitted by unstable nuclei

Fluorine-19 is a stable isotope of the element fluorine.

The element fluorine also has several radioactive isotopes.

Describe one similarity and one difference between the numbers of particles in one nucleus of fluorine-19 and one nucleus of a radioactive isotope of fluorine.

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The aluminium sheet is taken away.

The counter is reset to zero and then switched on again.

A new count is taken for 1 minute.

Explain why the new count is greater than 268.

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