Advertisements
Advertisements
Question
| Gamma rays | D | C | Visible light | B | A |
The above table shows different parts of the electromagnetic spectrum.
(a) Identify the parts of the spectrum marked as A, B, C and D.
(b) Which of the radiations A or B has the higher frequency?
(c) State two properties which are common to all parts of the electromagnetic spectrum.
(d) Name one source of each of the radiation of electromagnetic spectrum.
(e) Name one detector for each of the radiation.
(f) Name one use of each of the radiation.
Advertisements
Solution
(a) A, B, C and D are microwaves, infrared waves, ultraviolet light and x-rays respectively.
(b) Radiations B (microwaves) have a higher frequency.
(c) Common properties of e-m spectrum:
(i) All electromagnetic waves travel with the same speed in vacuum (or air) which is equal to the speed of light i.e. 3 x 108 m/s.
(ii) These waves are unaffected by the electric and magnetic fields.
(d)
| Name of wave | Source |
| 1. Gamma rays | 1. cosmic rays |
| 2. X rays | 2. When highly energetic electrons are stopped by a heavy metal target of high melting point (x-ray tube) |
|
3. Ultraviolet |
3. Sunlight |
| 4. visible light | 4. White hot bodies |
|
5. Infrared waves |
5. Lamp with thoriated filament. |
| 6. Microwaves |
6. Electronic devices such as klystron tube. |
| 7. Radio waves | 7. Radio transmissions. |
(e)
| Name of waves | Detector |
| 1. Gamma rays | 1. Geiger tube |
| 2. X rays | 2. Photographic film coated with zinc sulphide. |
| 3. Ultraviolet | 3. Photographic plate |
| 4. visible light | 4. Eye photo cells |
| 5. Infrared waves | 5. Thermopile |
| 6. Microwaves | 6. Wave guide tubes |
| 7. Radio waves | 7. Earphone |
(f)
| Name of waves | Use |
| 1. Gamma rays | 1. Detecting flaws in metal casting. |
| 2. X rays | 2. Diffraction to find crystal structure |
| 3. Ultraviolet | 3. Burglar alarms |
| 4. visible light | 4. Photography |
| 5. Infrared waves | 5. Infra - red photography |
| 6. Microwaves | 6. Microwave cooking |
| 7. Radio waves | 7. Communication and navigation. |
APPEARS IN
RELATED QUESTIONS
What is the range of the wavelength of the following electromagnetic waves?
(A) Radio waves.
Name the region beyond the violet end of the spectrum called.
50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1 mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of the aluminium foil that will allow 50% of the X-ray to pass through will be
Iron emits Kα X-ray of energy 6.4 keV. Calculate the times taken by an iron Kα photon to cross through a distance of 3 km.
(Use Planck constant h = 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
The Kα and Kβ X-rays of molybdenum have wavelengths 0.71 A and 0.63 A respectively. Find the wavelength of Lα X-ray of molybdenum.
The Kα and Kβ X-rays of molybdenum have wavelengths 0.71 A and 0.63 A respectively. Find the wavelength of Lα X-ray of molybdenum.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Answer briefly.
What are radio waves?
The area to be covered for T.V telecast is doubled then the height of transmitting antenna (T.V tower) will have to be:-
Electromagnetic waves with wavelength
- λ1 is suitable for radar systems used in aircraft navigation.
- λ2 is used to kill germs in water purifiers.
- λ3 is used to improve visibility in runways during fog and mist conditions.
Identify and name the part of the electromagnetic spectrum to which these radiations belong. Also arrange these wavelengths in ascending order of their magnitude.
Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong?
