The newest 15 of 13 written questions. Open one to see it on the real paper.
State the two other regions of the electromagnetic spectrum in which the Sun radiates most of its energy. 1.
See it on the paper →Place ultraviolet radiation into the incomplete electromagnetic spectrum shown in Figure 12.1. increasing frequenc ~< g treq y gamma rays X-rays microwaves Figure 12.1
See it on the paper →γ-radiation with a frequency of 6 × 10 19 Hz travels at a speed of 3 × 10 8 m / s. Calculate the wavelength of γ-radiation. State the unit of your answer. wavelength = unit
See it on the paper →Ultraviolet waves travel at 300 000 000 m / s in a vacuum. State the speed of infrared waves in a vacuum. speed = m / s (ii)
See it on the paper →The radio waves emitted by the tracker unit have a frequency of 1.5 × 10 9 Hz. Calculate the wavelength of the radio waves. wavelength = m
See it on the paper →The desk lamp emits light with wavelengths ranging from 3.8 × 10 –7 m to 7.5 × 10 –7 m. Calculate the minimum frequency of light emitted by the desk lamp. minimum frequency = Hz
See it on the paper →State the speed of X‑rays. m / s
See it on the paper →Many fully correct responses. Almost all candidates scored at least one mark quoting the speed of light or a correct equation (without further calculation). The question asked for the minimum frequency, some calculated the maximum frequency, which scored two marks. Another case of read the question carefully or perhaps not understanding the relationship between frequency and wavelength
— Examiner report, October/November 2023, 0654/43 Q12(a)(iii) (Cambridge)
Those who could rearrange the wave equation usually arrived at the frequency consistent with their suggestion for the speed.
— Examiner report, May/June 2023, 0654/43 Q12(a)(ii) (Cambridge)
Even when the value of the speed of gamma radiation was known, units were seldom provided.
— Examiner report, October/November 2022, 0654/41 Q12(c)(i) (Cambridge)
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An X‑ray machine in a hospital uses X‑rays with a wavelength of 2.0 × 10 –11 m. Calculate the frequency of these X‑rays. frequency = Hz
State the speed of gamma radiation in a vacuum.
See it on the paper →State the speed of the gamma rays produced by radioactive decay.
See it on the paper →A gamma ray has a wavelength of 2.0 × 10 –11 m. Use your answer to (d)(ii) to calculate the frequency of this gamma ray. State the unit for your answer. frequency = unit
See it on the paper →Fig. 12.1 shows an incomplete electromagnetic spectrum. Place γ‑radiation in its correct place in Fig. 12.1. ultraviolet visible light microwaves
See it on the paper →Place visible light and infrared in their correct positions in the incomplete electromagnetic spectrum in Fig. 12.4. gamma rays radio waves Fig. 12.4
See it on the paper →Each part of the electromagnetic spectrum has a different frequency. In terms of waves, state the meaning of the term frequency.
See it on the paper →Which region of the electromagnetic spectrum is often involved in heat transfer by radiation?
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