Waves and the Electromagnetic Spectrum PDF

TOPIC TEST REVIEW Waves and the Electromagnetic Spectrum Use the provided information to review the correct answers on the Test. 1. Space telescopes currently detect short wavelengths of light, such as gamma rays and X-rays. The ozone layer prevents these wavelengths from reaching...

TOPIC TEST REVIEW Waves and the Electromagnetic Spectrum Use the provided information to review the correct answers on the Test. 1. Space telescopes currently detect short wavelengths of light, such as gamma rays and X-rays. The ozone layer prevents these wavelengths from reaching ground telescopes. 2. Ultraviolet radiation causes materials to fade. Reducing the ozone layer would increase the amount of electromagnetic radiation reaching Earth causing material to fade faster. 3. Low frequency, long wavelength electromagnetic radiation is not affected by the atmosphere, so it reaches Earth’s surface. 4. Based on the image, you can see that the frequency of the wave changes in an FM signal because the wavelengths are shorter on each end and longer in the middle. In AM radio waves, only the amplitude of the signal changes. The FM waves alternate between high and low frequency. AM waves are consistently higher frequency than FM waves, enabling them to travel farther. 5. Electromagnetic waves used in medical imaging use high frequencies and large amplitudes. Both produce high energy. Gamma rays have the highest frequency of the electromagnetic waves, which is evidence for Student A’s position that high frequency waves are used in medical imaging. 6. Visible light has higher frequencies than infrared light. The opaque plastic bag blocks visible light wavelengths but allows infrared wavelengths to pass through. 7. Some types of electromagnetic radiation are considered “ionizing”, which means it has the ability to change the atoms in the matter it interacts with. This radiation is damaging to the human body. X-rays, gamma rays, and ultraviolet waves can all damage the human body. 8. Gamma rays have the highest frequency followed by microwaves, ultraviolet, visible light, and infrared. 9. Microwave ovens operate by causing water molecules to vibrate and pass thermal energy to surrounding particles. The food heats up quickly in a microwave because the particles vibrate faster.The wavelength of microwaves is 12 cm, which is significantly longer than the wavelength of an ultraviolet wave. Copyright © Savvas Learning Company LLC. All Rights Reserved. Savvas is not responsible for any modifications made by end users to the content posted in its original format. 10. Energy is carried in waves based on their frequency and amplitude. An increase in amplitude or wavelength would result in an increase in energy. To increase the wavelength, she would need to move the rope faster, which she can’t. Since Shamari cannot increase the wavelength, she needs to increase the amplitude. 11. X-rays, gamma rays and ultraviolet waves are used for radiation. All three of these are high energy with a high frequency and a short wavelength. 12. Reflection changes the direction of waves when they hit a barrier, and refraction changes the direction of waves when they pass from one medium to another. When a camera lens bends light to focus, the waves are refracted. Another example of refraction is when a straw in a glass of water appears to be broken in half because the light waves change direction as they pass through the different materials. 13. Amplitude is the measure of the height of a wave. Since children are shorter than adults, the amplitude of the wave will decrease. 14. Wave frequency is defined as the amount of waves that pass a fixed point in a given amount of time. Each time, the crowd did the wave for 5 minutes. The second time, more wave cycles went around the stadium. The frequency of the wave increased because more wave cycles occurred in the same amount of time. 15. Frequency and wavelength are inversely proportional to each other. A wave with a higher frequency will have a shorter wavelength. Copyright © Savvas Learning Company LLC. All Rights Reserved. Savvas is not responsible for any modifications made by end users to the content posted in its original format.