PHYSICS ELECTROMAGNETIC SPECTRUM REVISION QUESTIONS

ELECTROMAGNETIC SPECTRUM

  1. State one-way of detecting ultra violet radiation.
  2. Arrange the following radiations in order of increasing wavelengths.

Ultraviolet                  Gamma Rays

Radio Waves              Infra Red

  1. Name two types of electromagnetic radiations whose frequencies are greater than that of visible light.
  2. Calculate the wavelength of the KBC FM radio waves transmitted at a frequency of 95.6 mega hertz.
  3. The chart below shows an arrangement of different parts of the electromagnetic spectrum. Complete the table.
Type of Radiation Detector Uses
Ultraviolet Photographic paper, fluorescent

material, phototransistor

Radio waves Balanced thermometer Warmth sensation, making toast.
Radio waves Communication
  1. Arrange the following in order of increasing frequency. Visible light, infrared radiation, x-rays, u.v. radiation, radio waves.
  2. State the difference between X-rays and gamma rays in the way in which they are produced
  3. Other than a photographic film state one other detectors of
  4. i) X-rays
  5. ii) UV radiation

iii) Visible spectrum

  1. iv) Infra-red radiations
  2. State 3 uses of infra- red radiation.
  3. Name two properties of ultra-violent radiation.
  4. State the origin of all electromagnetic -radiation from radio waves to x-rays.
  5. State where Gamma rays originate.
  6. State one common property for electromagnetic waves and state one use of microwaves and one for ultraviolet radiation.
  7. State one common property for electromagnetic waves and state one use of microwaves and one for ultraviolet radiation.
  8. Name the radiation represented by A.

Radio Infrared visible A- rays Gamma Rays

  1. Complete the table below to show the name and use of some types of electromagnetic radiation.
Type of radiation Use
Sending information to and from satellites
Normal photography
Producing shadow pictures of bones
Gamma rays
  1. Give one important use of each of the following electromagnetic-waves.
  2. i) Microwaves
  3. ii) Infrared
  1. The figure below shows emitters of electromagnetic waves. Fit in their detectors                                                                                                                    (3mks)

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  1. Name the part of the electromagnetic spectrum used in communication by mobile phones.
  1. The audible frequency range for a certain person is 30Hz to 16500Hz. determine the largest wavelength of sound in air the person can detect. Speed of sound 340m/s
  2. Arrange the following electromagnetic waves in ascending order of frequency.

Infrared, x – rays, visible light, radio waves

  1. Arrange the following radiations in order of increasing wavelengths.

Gamma rays, purple light, ultraviolet and infrared

  1. Arrange the following radiations in order of increasing wavelength. Radio waves, Gamma rays infrared and ultraviolet.
  1. The table below shows an electromagnetic spectrum. Complete the table in the order of increasing wavelength from A – B.       (2 marks)

 

A Visible

Light

B

 

  1. Name one region of the electromagnetic spectrum which has a wavelength greater than visible light and state briefly how the radiation can be produced.
  1. Arrange the following radiation in order of increasing wavelength; ultraviolet, gamma rays, radio waves and visible light.
  1. Arrange the following waves in the order of increasing wavelength :- X-rays, visible light, infra-red, T.V waves, micro waves
  1. The figure 4 shows regions of the electromagnetic spectrum.  D is the region of visible light

 

A B C D E F G

Decreasing wave length

 

Indicate the region for the following;                                                                                    ( 2 marks )

  1. X – rays _______________________________________________
  2. Ultraviolet ______________________________________________

 

  1. Light of frequency 5.5 ´ 1014HZ is made to strike a metal surface whose work function is 2.5eV. Show that photoelectric effect will not take place. (Planck’s constant h = 6.63 ´ 10ˉ34JS, charge on an electron e =         6 ´ 10ˉ19C).
  2. Below is part of the electromagnetic spectrum in order of increasing wavelength.
A B C Visible light Infra-red D E

 

 

How are waves A produced?

  1. The chart below shows an arrangement of different parts of the electromagnetic spectrum.

 

Radio A Visible Ultra-

violet

X-Rays Gamma

rays

 

Name the radiation represented by A.

  1. The figure below shows regions of the electromagnetic spectrum. F is a region of x-rays. Indicate the region of visible light.
A B C D E F G

 

 

 

 

 

  1. The following are electromagnetic waves. Arrange them according to their increasing frequency. Gamma rays, microwaves, ultra-violet, TV waves and blue light.
  2. Complete the following table
Radiation Source Detector Application
Radio Communication
Hot body Drying clothes

 

  1. a) Name two properties common to all electromagnetic waves
  2. Arrange the following waves in ascending order of frequency
  3. V
  4. Radio waves
  • Light
  1. X-rays
  2. c) V. Waves have a frequency of 3×10-4 HZ. Determine the their wavelength
  3. Name one method of detecting radio waves
  4. e) State one application of microwaves
  5. (a) Consider the table below for some electromagnetic waves
Radiation Production Detection Application
Radio waves A Aerials B
Infrared Thermal vibration of atoms of hot bodies C D

 

(i)        Fill in the spaces labeled                                                                    (4mks)

A…………………………………………………………………………………….

B……………………………………………………………………………………

C……………………………………………………………………………………

D…………………………………………………………………………………….

(ii)       State one similarity between ultraviolet rays and gamma rays in terms of their

Dangers

 

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