Electromagnetic Wave Interactive Worksheet - Edform - Free Printable
Educational worksheet: Electromagnetic Wave Interactive Worksheet - Edform. Download and print for classroom or home learning activities.
JPG
1600×2262
220.5 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #1102222
⭐
Show Answer Key & Explanations
Step-by-step solution for: Electromagnetic Wave Interactive Worksheet - Edform
▼
Show Answer Key & Explanations
Step-by-step solution for: Electromagnetic Wave Interactive Worksheet - Edform
Here is the complete solution to the worksheet "The electromagnetic spectrum," with explanations for each answer.
---
1. Gamma rays travel faster than visible light.
✔ Answer: false
*Explanation:* All electromagnetic waves, including gamma rays and visible light, travel at the same speed in a vacuum — the speed of light (c ≈ 3 × 10⁸ m/s). Their speed does not depend on frequency or wavelength.
---
2. All electromagnetic waves travel at the same speed in a vacuum.
✔ Answer: true
*Explanation:* This is a fundamental principle of electromagnetism. In a vacuum, all EM waves propagate at *c* = 300,000,000 m/s, regardless of type.
---
3. The speed of light in a vacuum is...
✔ Answer: 300,000,000 ms⁻¹
*Explanation:* The exact value is 299,792,458 m/s, but it is commonly approximated as 3 × 10⁸ m/s or 300,000,000 m/s. The other options are incorrect: 31 m/s is too slow (like a car), 300 m/s is speed of sound, and “infinite” is wrong.
---
4. White light is a mixture of colours that can be split into the visible spectrum by a ...
✔ Answer: prism
*Explanation:* A prism refracts (bends) different wavelengths of light by different amounts, dispersing white light into its component colors (ROYGBIV). Rainbows are natural prisms, but the instrument used is a prism. “Prison” and “migraine” are distractors.
---
5. Which of the following has the highest frequency?
✔ Answer: x-rays
*Explanation:* In the EM spectrum, frequency increases from radio → microwave → infrared → visible → ultraviolet → x-rays → gamma rays. So among the options, x-rays have higher frequency than ultraviolet, microwaves, and radiowaves.
*(Note: Gamma rays have even higher frequency than x-rays, but they’re not listed here.)*
---
6. Which of the following has the highest frequency?
✔ Answer: visible light
*Explanation:* Comparing the given options: visible light > infrared > microwaves > radiowaves. Visible light has higher frequency than the others listed.
---
7. Which of the following has the longest wavelength?
✔ Answer: radiowaves
*Explanation:* Wavelength is inversely proportional to frequency. Radiowaves have the lowest frequency in the EM spectrum, so they have the longest wavelength.
---
8. Which of the following has the shortest wavelength?
✔ Answer: gamma rays
*Explanation:* Gamma rays have the highest frequency and therefore the shortest wavelength in the EM spectrum.
---
9. Which of the following has the lowest frequency?
✔ Answer: radiowaves
*Explanation:* Radiowaves are at the low-frequency end of the EM spectrum, so they have the lowest frequency among the options.
---
10. These waves have the longest wavelength and are used to carry signals for radar, TV and radio
✔ Answer: radiowaves
*Explanation:* Radiowaves are used for broadcasting (radio, TV) and communication (including some radar systems). They have long wavelengths, which allow them to diffract around obstacles and travel long distances.
---
11. These rays are absorbed by bones and teeth but pass through flesh
✔ Answer: x-rays
*Explanation:* X-rays penetrate soft tissue (flesh) but are absorbed by denser materials like bone and teeth — this is why they’re used in medical imaging.
---
12. These waves are used to cook food (they are absorbed by water molecules in the food)
✔ Answer: micro-waves
*Explanation:* Microwave ovens emit microwaves that cause water molecules to vibrate, generating heat. This is how food is cooked.
---
13. Our eyes are able to see waves in this part of the electromagnetic spectrum
✔ Answer: visible
*Explanation:* The human eye detects electromagnetic radiation in the visible light range (~400–700 nm).
---
14. Any warm object emits this wave. Night vision cameras are able to detect this type of wave.
✔ Answer: infrared
*Explanation:* All objects above absolute zero emit infrared radiation. Warmer objects emit more. Night vision devices detect this IR radiation to “see” in the dark.
---
15. These rays are emitted by the sun (and other white hot objects). Over-exposure to these rays can burn the skin and cause skin cancer.
✔ Answer: ultraviolet
*Explanation:* The Sun emits UV radiation, which can damage skin cells, leading to sunburn and increasing the risk of skin cancer. UV is also responsible for tanning.
---
1. false
2. true
3. 300,000,000 ms⁻¹
4. prism
5. x-rays
6. visible light
7. radiowaves
8. gamma rays
9. radiowaves
10. radiowaves
11. x-rays
12. micro-waves
13. visible
14. infrared
15. ultraviolet
Let me know if you’d like a diagram of the EM spectrum to visualize this!
---
1. Gamma rays travel faster than visible light.
✔ Answer: false
*Explanation:* All electromagnetic waves, including gamma rays and visible light, travel at the same speed in a vacuum — the speed of light (c ≈ 3 × 10⁸ m/s). Their speed does not depend on frequency or wavelength.
---
2. All electromagnetic waves travel at the same speed in a vacuum.
✔ Answer: true
*Explanation:* This is a fundamental principle of electromagnetism. In a vacuum, all EM waves propagate at *c* = 300,000,000 m/s, regardless of type.
---
3. The speed of light in a vacuum is...
✔ Answer: 300,000,000 ms⁻¹
*Explanation:* The exact value is 299,792,458 m/s, but it is commonly approximated as 3 × 10⁸ m/s or 300,000,000 m/s. The other options are incorrect: 31 m/s is too slow (like a car), 300 m/s is speed of sound, and “infinite” is wrong.
---
4. White light is a mixture of colours that can be split into the visible spectrum by a ...
✔ Answer: prism
*Explanation:* A prism refracts (bends) different wavelengths of light by different amounts, dispersing white light into its component colors (ROYGBIV). Rainbows are natural prisms, but the instrument used is a prism. “Prison” and “migraine” are distractors.
---
5. Which of the following has the highest frequency?
✔ Answer: x-rays
*Explanation:* In the EM spectrum, frequency increases from radio → microwave → infrared → visible → ultraviolet → x-rays → gamma rays. So among the options, x-rays have higher frequency than ultraviolet, microwaves, and radiowaves.
*(Note: Gamma rays have even higher frequency than x-rays, but they’re not listed here.)*
---
6. Which of the following has the highest frequency?
✔ Answer: visible light
*Explanation:* Comparing the given options: visible light > infrared > microwaves > radiowaves. Visible light has higher frequency than the others listed.
---
7. Which of the following has the longest wavelength?
✔ Answer: radiowaves
*Explanation:* Wavelength is inversely proportional to frequency. Radiowaves have the lowest frequency in the EM spectrum, so they have the longest wavelength.
---
8. Which of the following has the shortest wavelength?
✔ Answer: gamma rays
*Explanation:* Gamma rays have the highest frequency and therefore the shortest wavelength in the EM spectrum.
---
9. Which of the following has the lowest frequency?
✔ Answer: radiowaves
*Explanation:* Radiowaves are at the low-frequency end of the EM spectrum, so they have the lowest frequency among the options.
---
10. These waves have the longest wavelength and are used to carry signals for radar, TV and radio
✔ Answer: radiowaves
*Explanation:* Radiowaves are used for broadcasting (radio, TV) and communication (including some radar systems). They have long wavelengths, which allow them to diffract around obstacles and travel long distances.
---
11. These rays are absorbed by bones and teeth but pass through flesh
✔ Answer: x-rays
*Explanation:* X-rays penetrate soft tissue (flesh) but are absorbed by denser materials like bone and teeth — this is why they’re used in medical imaging.
---
12. These waves are used to cook food (they are absorbed by water molecules in the food)
✔ Answer: micro-waves
*Explanation:* Microwave ovens emit microwaves that cause water molecules to vibrate, generating heat. This is how food is cooked.
---
13. Our eyes are able to see waves in this part of the electromagnetic spectrum
✔ Answer: visible
*Explanation:* The human eye detects electromagnetic radiation in the visible light range (~400–700 nm).
---
14. Any warm object emits this wave. Night vision cameras are able to detect this type of wave.
✔ Answer: infrared
*Explanation:* All objects above absolute zero emit infrared radiation. Warmer objects emit more. Night vision devices detect this IR radiation to “see” in the dark.
---
15. These rays are emitted by the sun (and other white hot objects). Over-exposure to these rays can burn the skin and cause skin cancer.
✔ Answer: ultraviolet
*Explanation:* The Sun emits UV radiation, which can damage skin cells, leading to sunburn and increasing the risk of skin cancer. UV is also responsible for tanning.
---
✔ Final Answers Summary:
1. false
2. true
3. 300,000,000 ms⁻¹
4. prism
5. x-rays
6. visible light
7. radiowaves
8. gamma rays
9. radiowaves
10. radiowaves
11. x-rays
12. micro-waves
13. visible
14. infrared
15. ultraviolet
Let me know if you’d like a diagram of the EM spectrum to visualize this!
Parent Tip: Review the logic above to help your child master the concept of electromagnetic wave worksheet.
