Which of these statements is/are not valid?      I. X-rays are less energetic than gamma rays.      II. Red light has a longer wavelength than green light.      III. Magnetic wave vector, B always propagates parallel to electric wave, E.      IV. Violet light has less frequency than the red light.*1 pointI, II & III onlyII & III onlyIII & IV onlyAll of the above

Which of the following statements about gamma rays is incorrect?Gamma rays are used in both medical imaging and radiotherapyGamma rays are produced when there are changes to the nuclei of atomsGamma rays can penetrate the body and can damage, mutate or kill cellsWhen a gamma ray is emitted, the amount of nuclear energy stored within a nucleus increases2Which of the following statements about x-rays is incorrect?X-rays are the second shortest-wavelength type of wave on the electromagnetic spectrum (only gamma rays have shorter wavelengths than x-rays)X-rays are used in both medical imaging and medical treatmentX-rays are produced by the rapid deceleration of free electrons and by changes in the organisation of the electrons that orbit the nuclei of atomsX-rays are absorbed effectively by soft body tissue but pass easily through bone3Which of the following types of electromagnetic radiation has the lowest frequency?Radio wavesMicrowavesUltravioletVisible light4In the visible spectrum, which colour lies between blue and violet?LilacPinkUltravioletIndigo5Which of the following does NOT involve the use of infrared waves?RadiotherapyRemote controlsCookersFibre-optic communications6What a control variable?The variable which is measured in an investigationThe variable which is changed in an investigationA variable which is more important than (at least some of) the other variables in an investigationA variable that is kept constant in an investigation

Identify whether the following statement is true or false. Gamma rays are the type of electromagnetic radiation with the highest energy.TrueFalse

Choose TRUE or FALSE for each of these statements.A. Wavelength is directly proportional to energy so if wavelength increases, energy increases as well. B. Microwaves have a longer wavelength than visible light.  C. The wavelength of blue light is about 600 nm. D. The line spectrum of an atom shows that electrons can only have a few energies, not any energy.  E. When a photon of light is emitted from an atom, that means the electron is losing energy.  F. When an electron moves closer to the nucleus, a photon of light is emitted.  G. The transition from the third orbit (n=3) to the first orbit (n=1) is lower energy than the transition from the second orbit (n=2) to the first orbit (n=1).

Which of these statements describe visible light waves? Choose the two that apply. A. Red light has a longer distance between wave crests than blue light. B. Yellow light has a shorter distance between wave crests than green light. C. Blue light has a longer distance between wave crests than red light. D. Blue light has a shorter distance between wave crests than orange light. E. Orange light has a shorter distance between wave crests than violet light.

Using the diagram above, identify the missing words in the sentences below. Type them into the right hand column.X-rays have shorter wavelengths and ____________ energy than UV radiation.Radio waves have ____________ wavelengths and ____________ energy than gamma rays.Microwaves have ____________ wavelengths and ____________ energy than visible light.EM waves with shorter wavelengths have ____________ energy than EM waves with longer wavelengths.