Electromagnetic Spectrum

9.Explain why gamma rays are used to treat cancer.

10.Match each region of the electromagnetic spectrum to its typical use.

11.Which of the following statements about electromagnetic waves is correct?

12.Which of the following is the correct order of the electromagnetic spectrum from longest wavelength to shortest wavelength?

13.Which of the following electromagnetic waves has the highest frequency?

14.Arrange the following regions of the electromagnetic spectrum in order of increasing frequency (lowest first).

15.Which of the following are uses of microwaves? Select all that apply.

16.Arrange the following electromagnetic regions in order of increasing danger from ionising radiation (least dangerous first).

17.Which of the following statements about the dangers of electromagnetic waves are correct? Select all that apply.

18.Match each type of electromagnetic radiation to its associated danger.

19.A student investigates how the intensity of light from a lamp varies with distance. She uses a light sensor connected to a data logger. The lamp emits visible light. Which property of the electromagnetic waves emitted by the lamp is the same as that of radio waves?

20.Which of the following statements about the electromagnetic spectrum are correct? Select all that apply.

21.All electromagnetic waves travel at the same speed in air.

22.Arrange the following electromagnetic radiations in order of increasing energy per photon (lowest energy first).

23.A remote control uses infrared radiation to communicate with a television. Which of the following is a property of infrared radiation that makes it suitable for this use?

24.Ultraviolet radiation has a longer wavelength than infrared radiation.

25.Which of the following are harmful effects of excessive exposure to electromagnetic radiation? Select all that apply.

26.A student is investigating the absorption of infrared radiation by different surfaces. She uses a Leslie cube, a heat source, and a thermometer. Which of the following is the independent variable in this experiment?

27.Which of the following are correct experimental methods to investigate the properties of electromagnetic waves? Select all that apply.

28.In a vacuum, all electromagnetic waves travel at the same speed of 3.0 × 10⁸ m/s.

29.A student sets up an experiment to measure the wavelength of microwaves using a double slit. The slits are 5.0 cm apart and the screen is 1.0 m away. The distance between the central maximum and the first order maximum is 6.0 cm. What is the wavelength of the microwaves?

30.Which of the following is a practical use of X-rays?

31.Electromagnetic waves are transverse waves that transfer energy from the source to an absorber.

32.Which type of electromagnetic radiation is used for television transmissions?

33.Which of the following statements about the dangers of electromagnetic waves is correct?

34.Arrange the following regions of the electromagnetic spectrum in order of increasing frequency (lowest frequency first).

35.Which of the following are correct statements about the properties of electromagnetic waves? Select all that apply.

36.Gamma rays have a longer wavelength than radio waves.

37.Which type of electromagnetic radiation is used for cooking food in microwave ovens?

38.Arrange the following electromagnetic radiations in order of increasing danger from ionising radiation (least dangerous first).

39.A student uses a microwave transmitter and receiver to investigate the properties of microwaves. She places a metal sheet between them and observes that the receiver no longer detects a signal. She then removes the metal sheet and places a piece of cardboard in its place; the receiver still detects a signal. What property of microwaves does this experiment demonstrate?

40.Which of the following are uses of infrared radiation? Select all that apply.

41.Arrange the following electromagnetic radiations in order of increasing frequency (lowest frequency first).

42.A student investigates the absorption of infrared radiation by different surfaces. She uses a Leslie cube, a heat source, and a thermometer. The Leslie cube has four sides: black dull, white dull, black shiny, and white shiny. She fills the cube with hot water and measures the temperature of each side after a fixed time. Which side is expected to have the highest temperature?

43.Complete the sentence: Electromagnetic waves are transverse waves that transfer _____ from the source to an absorber.

44.Complete the sentence with the missing word.

45.State one use of radio waves.

46.A microwave has a frequency of 2.45 × 10⁹ Hz. Calculate its wavelength in a vacuum. (Speed of electromagnetic waves in vacuum = 3.0 × 10⁸ m/s)

47.Complete the sentence: The visible spectrum is part of the electromagnetic spectrum. The colour with the longest wavelength in visible light is ___.

48.State one use of X-rays.

49.Explain why gamma rays are more dangerous than radio waves.

50.Explain why X-rays are used to take images of bones inside the body.

51.A microwave has a frequency of 2.45 × 10⁹ Hz. Calculate its wavelength in a vacuum. (Speed of electromagnetic waves in vacuum = 3.0 × 10⁸ m/s)