問 1
1 点Which part of the electromagnetic spectrum is used for both satellite transmissions and cooking food?
Pearson Edexcel GCSE (9-1) · Physics (1PH0)
Electromagnetic spectrum: uses and dangers：練習問題
その場で採点される選択問題 5 問と、解説つきの記述問題 2 問。すべて「Electromagnetic spectrum: uses and dangers」からの出題です。
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問 2
1 点When light travels from air into a rectangular glass block at an angle to the normal, which of the following describes its change in speed and direction?
問 3
1 点A ray of light is incident on the boundary between glass and air. The critical angle for glass is \(42^{\circ}\). If the angle of incidence is increased from \(40^{\circ}\) to \(45^{\circ}\), what happens to the ray?
問 4
1 点The power of a lens is given as \(+5.0\text{ D}\). Calculate the focal length of this lens and identify its type.
問 5
1 点The Earth’s temperature depends on the balance between the rate of energy received from the Sun and the rate of energy radiated back into space. If the Earth's atmosphere becomes more effective at absorbing infrared radiation emitted from the surface without changing the rate of incoming solar radiation, what happens to the Earth's temperature and the power it radiates?
問 6
4 点An object is placed in front of a converging lens. The lens has a power of \(+5.0\) dioptres.
(a) Calculate the focal length of this lens in centimeters.(b) Describe the difference between a real image and a virtual image produced by a lens.
(c) State one use of ultraviolet radiation and one associated danger of overexposure to it.
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問 7
7 点Visible light and X-rays are both parts of the electromagnetic spectrum. A specific source emits visible light with a wavelength of \(5.0 \times 10^{-7}\) m.
(a) All electromagnetic waves travel at the same speed in a vacuum. State this speed and calculate the frequency of this visible light. (\(v = f \times \lambda\)).(b) X-rays have a much higher frequency than visible light. Explain, in terms of atoms and energy, how X-rays can be produced and why they pose a greater risk to human health than visible light.
(c) A beam of light travels from air into a glass block. Describe what happens to the speed, wavelength, and direction of the light as it enters the glass at an angle.
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