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Electromagnetic Waves and Reflection. Risorsa didattica per il CLIL di Fisica in lingua inglese

red - Di seguito vengono proposti alcuni problemi inerenti alle onde elettromagnetiche, agli specchi concavi e agli specchi convessi. La risorsa può essere utilizzata nelle classi in cui sono attivi dei percorsi CLIl di Fisica in lingua inglese.

Electromagnetic Waves

  1. Gamma-ray bursters are objects in the universe that emit pulses of gamma rays with high energies. The frequency of the most energetic bursts has been measured at around 3.0 x 1021 Hz. What is the wavelength of these gamma rays?

  2. What is the wavelength range for the FM radio band (88 MHz–108 MHz)? (MHz = Megahertz)

  3. Shortwave radio is broadcast between 3.50 and 29.7 MHz. To what range of wavelengths does this correspond? Why do you suppose this part of the spectrum is called shortwave radio?

  4. What is the frequency of an electromagnetic wave if it has a wavelength of 1.0 km?

  5. The portion of the visible spectrum that appears brightest to the human eye is around 560 nm in wavelength, which corresponds to yellow-green. What is the frequency of 560 nm light? (nm=nanometers)

  6. What is the frequency of highly energetic ultraviolet radiation that has a wavelength of 125 nm?

Concave Mirrors

  1. Find the image distance and magnification of a mirror (f = +10.0 cm) when the object distances are 10.0 cm and 5.00 cm. Are the images real or virtual? Are the images inverted or upright?

  2. A concave shaving mirror has a focal length of 33 cm. Calculate the image position of a cologne bottle placed in front of the mirror at a distance of 93 cm. Calculate the magnification of the image. Is the image real or virtual? Is the image inverted or upright?

  3. A concave makeup mirror is designed so that a person 25.0 cm in front of it sees an upright image at a distance of 50.0 cm behind the mirror. What is the radius of curvature of the mirror? What is the magnification of the image? Is the image real or virtual?

  4. A pen placed 11.0 cm from a concave spherical mirror produces a real image 13.2 cm from the mirror.What is the focal length of the mirror? What is the magnification of the image? If the pen is placed 27.0 cm from the mirror, what is the new position of the image? What is the magnification of the new image? Is the new image real or virtual?

Convex Mirrors

  1. The image of a crayon appears to be 23.0 cm behind the surface of a convex mirror and is 1.70 cm tall. If the mirror’s focal length is 46.0 cm, how far in front of the mirror is the crayon positioned? What is the magnification of the image? Is the image virtual or real? Is the image inverted or upright? How tall is the actual crayon?

  2. A convex mirror with a focal length of 0.25 m forms a 0.080 m tall image of an automobile at a distance of 0.24 m behind the mirror.What is the magnification of the image? Where is the car located, and what is its height? Is the image real or virtual? Is the image upright or inverted?

  3. A convex mirror of focal length 33 cm forms an image of a soda bottle at a distance of 19 cm behind the mirror. If the height of the image is 7.0 cm, where is the object located, and how tall is it? What is the magnification of the image? Is the image virtual or real? Is the image inverted or upright?

  4. A convex mirror with a radius of curvature of 0.550 m is placed above the aisles in a store. Determine the image distance and magnification of a customer lying on the floor 3.1 m below the mirror. Is the image virtual or real? Is the image inverted or upright?

  5. A spherical glass ornament is 6.00 cm in diameter. If an object is placed 10.5 cm away from the ornament, where will its image form? What is the magnification? Is the image virtual or real? Is the image inverted or upright?

  6. A candle is 49 cm in front of a convex spherical mirror that has a focal length of 35 cm.What are the image distance and magnification? Is the image virtual or real? Is the image inverted or upright?

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