electromagnetic spectrum practice
name
use this website and your own research to answer the questions below:
www.sciencelearn.org.nz/image_maps/63-the-electromagnetic-spectrum
fill in the blanks for the following questions with the words in the bank. some words will be used more than once.
ultraviolet rays visible light wavelength x rays microwaves
electromagnetic spectrum infrared waves radio waves frequency gamma rays
1. the ____________ represents the range of different forms of electromagnetic wav
2. ____________ and ____________ are used to communicate through wi-fi.
3. heat radiation, also known as ____________, cannot be seen by your eyes but can be felt your skin.
4. because ____________ and ____________ can be used to communicate with satellites.
5. ____________ and ____________ have the highest energy of all electromagnetic radiation, th are the most damaging to human tissue.
6. even though they can’t kill you, ____________ can be dangerous to pregnant women d to the fetus inside of them.
7. if an electromagnetic wave has a low frequency, it will also have a long ____________.
8. compared to all other types of electromagnetic radiation, radio waves have the lowest ____________.
9. an overexposure to ____________ can result in sunburns and skin cancer.
10. the only part of the electromagnetic spectrum that humans can see is ____________.
match the kind of electromagnetic radiation (on the left) likely to be used in each of the following technologies (on the right)
wave type technology
11. x rays a tv broadcast signals
12. microwaves b use in doctors and dentist offices to see past a person’s skin and muscles
13. gamma rays c cell phone
14. radio waves d lamp used to warm a baby chick
15. infrared waves e used by an oncologist (doctor who studies and treats cancer.
what are the differences between the different types of electromagnetic radiation?
16. which has a longer wavelength – visible or infrared radiation?
17. which contains more energy – visible or infrared radiation?
18. which has a higher frequency – visible or infrared radiation?
19. what happens to the wavelength and frequency as you move from radio waves to gamma rays on electromagnetic spectrum?

Question

Accepted Answer

### Fill in the Blanks
1. **Step 1: Recall the definition of the electromagnetic spectrum**
The electromagnetic spectrum is the range of all types of electromagnetic waves.
Answer: electromagnetic spectrum

2. **Step 1: Identify waves used in Wi - Fi**
Wi - Fi communication uses radio waves and microwaves.
Answer: Radio waves, Microwaves

3. **Step 1: Recall the name of heat radiation**
Heat radiation is also known as infrared waves.
Answer: Infrared waves

4. **Step 1: Identify waves for satellite communication**
Microwaves and radio waves are used for satellite communication.
Answer: Microwaves, Radio waves

5. **Step 1: Identify highest - energy electromagnetic radiation**
Gamma rays and X - rays have the highest energy among electromagnetic radiations.
Answer: Gamma rays, X rays

6. **Step 1: Identify radiation dangerous to pregnant women**
X - rays can be dangerous to pregnant women due to the fetus.
Answer: X rays

7. **Step 1: Relate frequency and wavelength**
The relationship between frequency ($f$) and wavelength ($\lambda$) is $c = f\lambda$ (where $c$ is the speed of light). If frequency is low, wavelength is long.
Answer: wavelength

8. **Step 1: Recall the property of radio waves**
Radio waves have the lowest frequency among electromagnetic radiations.
Answer: frequency

9. **Step 1: Recall the effect of ultraviolet rays**
Overexposure to ultraviolet rays can cause sunburns and skin cancer.
Answer: Ultraviolet rays

10. **Step 1: Recall visible part of the spectrum**
The only part of the electromagnetic spectrum that humans can see is visible light.
Answer: Visible light

### Matching
11. **Step 1: Recall use of X - rays**
X - rays are used in doctors' and dentists' offices to see past the skin and muscles. So X rays match with B.
Answer: 11. B

12. **Step 1: Recall use of microwaves**
Microwaves are used in cell phones. So Microwaves match with C.
Answer: 12. C

13. **Step 1: Recall use of gamma rays**
Gamma rays are used by oncologists (cancer doctors). So Gamma rays match with E.
Answer: 13. E

14. **Step 1: Recall use of radio waves**
Radio waves are used for TV broadcast signals. So Radio waves match with A.
Answer: 14. A

15. **Step 1: Recall use of infrared waves**
Infrared waves are used in lamps to warm baby chicks (for heat). So Infrared waves match with D.
Answer: 15. D

### Short - Answer Questions
16. **Step 1: Recall wavelength of visible and infrared**
Infrared radiation has a longer wavelength than visible radiation.
Answer: Infrared radiation

17. **Step 1: Recall energy - frequency - wavelength relationship**
Energy ($E$) is related to frequency by $E=hf$ (where $h$ is Planck's constant) and to wavelength by $E = \frac{hc}{\lambda}$. Visible light has a higher frequency (shorter wavelength) than infrared, so visible radiation contains more energy.
Answer: Visible radiation

18. **Step 1: Recall frequency of visible and infrared**
From $c = f\lambda$, since visible light has a shorter wavelength than infrared, it has a higher frequency.
Answer: Visible radiation

19. **Step 1: Recall trend in electromagnetic spectrum**
As we move from radio waves to gamma rays, the wavelength decreases (because $\lambda=\frac{c}{f}$ and frequency increases) and the frequency increases.
Answer: Wavelength decreases, frequency increases.

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