Pearson Edexcel International GCSE (9–1) · PHYSICS · Unit
Waves
356 practice questions
Topics covered
Practice questions
231–240 of 356
Question 231
3 marks · Normal
Answer and see the solution →Fill in the missing boxes in the table to correctly order the following electromagnetic waves by increasing frequency. Start with the lowest frequency.
Order (1 = lowest frequency) Wave type 1 Radio waves 2 ? 3 Visible light 4 ? 5 Gamma rays Question 232
3 marks · Normal
Answer and see the solution →The wavelength of a red light wave is m. Calculate the frequency of this light.
(The speed of light in a vacuum is m/s.)
Question 233
2 marks · Normal
Answer and see the solution →Explain why gamma rays and X-rays are placed at the same end of the electromagnetic spectrum.
Question 234
4 marks · Normal
Answer and see the solution →The diagram below represents the electromagnetic spectrum, but some wave types are missing.
Some wave types have been omitted from the spectrum. Wave type Relative position (increasing frequency) Radio waves 1 - 2 Visible light 3 - 4 Gamma rays 5 (a)[1 mark]Name the wave type that should be in position 2.
(b)[1 mark]Name the wave type that should be in position 4.
(c)[1 mark]State whether the wavelength of the wave in position 2 is longer or shorter than that of visible light.
(d)[1 mark]State one use of the wave type in position 4.
Question 235
3 marks · Normal
Answer and see the solution →Describe how the frequency and wavelength change as you move from radio waves to gamma rays across the electromagnetic spectrum.
Question 236
4 marks · Normal
Answer and see the solution →A student reads that all electromagnetic waves can be reflected and refracted. They want to investigate this for light.
Describe a laboratory experiment the student could perform to demonstrate the reflection and refraction of visible light, mentioning the main pieces of apparatus required.
(a)[1 mark]State the apparatus the student would need.
(b)[1 mark]Describe the procedure for demonstrating reflection.
(c)[1 mark]Describe the procedure for demonstrating refraction.
(d)[1 mark]State one observation the student could make in either part.
Question 237
2 marks · Easy
Answer and see the solution →State two uses of microwaves, other than for cooking food.
Question 238
1 mark · Easy
Answer and check →Which statement best explains why microwave ovens cook food more quickly than ordinary ovens?
- A.Microwaves heat only the air around the food.
- B.Microwaves heat the metal inside the oven.
- C.Microwaves are absorbed by water molecules in the food, heating it throughout.
- D.Microwaves make the outside of the food hotter than the inside.
Question 239
3 marks · Easy
Answer and see the solution →Explain why it is important that microwave ovens have metal screens or mesh on their doors. What could happen if there was no screen?
Question 240
2 marks · Easy
Answer and see the solution →Describe one protective measure you could take to reduce the risk from excessive exposure to microwaves, and explain how it works.