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QR Challenge: Uses of EM waves: CFR

Created using the ClassTools QR Treasure Hunt Generator

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Teacher Notes

A. Prior to the lesson:

1. Arrange students into groups. Each group needs at least ONE person who has a mobile device.

2. If their phone camera doesn't automatically detect and decode QR codes, ask students to

3. Print out the QR codes.

4. Cut them out and place them around your class / school.

B. The lesson:

1. Give each group a clipboard and a piece of paper so they can write down the decoded questions and their answers to them.

2. Explain to the students that the codes are hidden around the school. Each team will get ONE point for each question they correctly decode and copy down onto their sheet, and a further TWO points if they can then provide the correct answer and write this down underneath the question.

3. Away they go! The winner is the first team to return with the most correct answers in the time available. This could be within a lesson, or during a lunchbreak, or even over several days!

C. TIPS / OTHER IDEAS

4. A detailed case study in how to set up a successful QR Scavenger Hunt using this tool can be found here.

Questions / Answers (teacher reference)

Question

Answer

1. Q1) Here is an incomplete list of the parts of the electromagnetic spectrum. [A, microwaves, B, C, ultraviolet, D, gamma] What name is given to the group of waves at position A and C ? A = Radiowaves , C= visible light
2. Q2) Name the type of Electromagnetic waves used to see security markings ultraviolet
3. Q3) Name the type of Electromagnetic waves used to sterilise surgical instruments Gamma Rays
4. Q4) Radio waves, Microwaves, Infrared, Visible light, Ultraviolet, X-rays, Gamma rays. From left to right is the direction of increasing ____________ ? (select the the missing word from wavelength, speed, amplitude, frequency,) frequency
5. Q5) The range of wavelengths for waves in the electromagnetic spectrum is approximately A) 10^-15 to 10^4 metres B) 10^-4 to 10^4 metresC) 10^4 to 10^15 metres? A
6. Q6) The wavelength of a radio wave is 1500 m. Calculate the frequency of the radio wave. 2.0 × 10^5 Hz
7. Q7) State one hazard of exposure to infrared radiation. (skin) burns
8. Q8) State one hazard of exposure to ultraviolet radiation. skin cancer / blindness
9. Q9) X-rays are used in hospitals for computed tomography (CT) scans. State one other medical use for X-rays. (detecting) bone fractures, (detecting) dental problems, treating cancer.
10. Q10) Which one of the following is a use of X-rays? [Cleaning stained teeth, Killing cancer cells, Scanning of unborn babies] Killing cancer cells
11. Q11) 4 parts of the EM spectrum are used for communications. a) Which type of electromagnetic wave is used when a traffic signal communicates with a car driver? b) Which type of electromagnetic wave is used to communicate with a satellite in space? a= visible light, b=microwaves
12. Q12) The wavelength of infrared waves is [shorter than, the same as, longer than] the wavelength of radio waves. shorter than
13. Q13) Mobile phone networks send signals using microwaves. Some people think the energy a person’s head absorbs when using a mobile phone may be harmful to health. Scientists have compared the health of people who use mobile phones with the health of people who do not use mobile phones. Why did they do this? a) To find out if using a mobile phone is harmful to health. b) To find out if mobile phones give out radiation. c) To find out why some people are healthy. a
14. Q14) Infrared waves and microwaves are used for communications. Give one example of infrared waves being used for communication. (TV / video / DVD) remote controls OR short range data transmission (accept specific example, eg linking computer peripherals) OR optical fibre signals. [notes mobile phones is insufficient, do not accept Bluetooth]
15. Q15) A mobile phone network uses microwaves to transmit signals through the air. The microwaves have a frequency of 1.8 × 10^9 Hz Calculate the wavelength of the microwaves. Give your answer to two significant figures. 0.17 m OR 17 cm
16. Q16) Gamma rays have a wavelength of 0.5 x 10^-9 m. What speed do they travel at? 3x 10^8 m/s

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q1)-Here-is-an-incomplete-list-of-the-parts-of-the-electromagnetic-spectrum.-[A,-microwaves,-B,-C,-ultraviolet,-D,-gamma]-What-name-is-given-to-the-group-of-waves-at-position-A-and-C-?

Question 1 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q2)-Name-the-type-of-Electromagnetic-waves-used-to-see-security-markings

Question 2 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q3)-Name-the-type-of-Electromagnetic-waves-used-to-sterilise-surgical-instruments

Question 3 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q4)-Radio-waves,-Microwaves,-Infrared,-Visible-light,-Ultraviolet,-X-rays,-Gamma-rays.-From-left-to-right-is-the-direction-of-increasing-____________-?-(select-the-the-missing-word-from-wavelength,-speed,-amplitude,-frequency,)

Question 4 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q5)-The-range-of-wavelengths-for-waves-in-the-electromagnetic-spectrum-is-approximately-A)-10^-15--to---10^4-metres--B)-10^-4--to---10^4-metresC)-10^4--to---10^15-metres?

Question 5 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q6)-The-wavelength-of-a-radio-wave-is-1500-m.-Calculate-the-frequency-of-the-radio-wave.

Question 6 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q7)-----State-one-hazard-of-exposure-to-infrared-radiation.

Question 7 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q8)-----State-one-hazard-of-exposure-to-ultraviolet-radiation.

Question 8 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q9)-X-rays-are-used-in-hospitals-for-computed-tomography-(CT)-scans.-State-one-other-medical-use-for-X-rays.

Question 9 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q10)-Which-one-of-the-following-is-a-use-of-X-rays?-[Cleaning-stained-teeth,--Killing-cancer-cells,-Scanning-of-unborn-babies]

Question 10 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q11)--4--parts-of-the-EM-spectrum-are-used-for-communications.-a)--Which-type-of-electromagnetic-wave-is-used-when-a-traffic-signal-communicates-with-a-car-driver?-b)-Which-type-of-electromagnetic-wave-is-used-to-communicate-with-a-satellite-in-space?

Question 11 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q12)-The-wavelength-of-infrared-waves-is-[shorter-than,-the-same-as,-longer-than]-the-wavelength-of-radio-waves.

Question 12 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q13)-Mobile-phone-networks-send-signals-using-microwaves.-Some-people-think-the-energy-a-person’s-head-absorbs-when-using-a-mobile-phone-may-be-harmful-to-health.---Scientists-have-compared-the-health-of-people-who-use-mobile-phones-with-the-health-of-people-who-do-not-use-mobile-phones.-Why-did-they-do-this?-a)-To-find-out-if-using-a-mobile-phone-is-harmful-to-health.-b)-To-find-out-if-mobile-phones-give-out-radiation.-c)-To-find-out-why-some-people-are-healthy.

Question 13 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q14)---Infrared-waves-and-microwaves-are-used-for-communications.-Give-one-example-of-infrared-waves-being-used-for-communication.

Question 14 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q15)-A-mobile-phone-network-uses-microwaves-to-transmit-signals-through-the-air.-The-microwaves-have-a-frequency-of-1.8-×-10^9-Hz-Calculate-the-wavelength-of-the-microwaves.-Give-your-answer-to-two-significant-figures.

Question 15 (of 16)

 


Uses of EM waves: CFR: QR Challenge

https://www.classtools.net/QR/decode.php?text=Q16)-Gamma-rays-have-a-wavelength-of-0.5-x-10^-9-m.-What-speed-do-they-travel-at?

Question 16 (of 16)