None of the E) Explanation: As the source moves away, the sound waves stretches out relative to the person standing still; so the pitch drops. Even though the sound waves are being emitted at the same frequency, the distance is not constant; so as the object gets farther and farther away, there appears to be more time between waves to the individual standing still; so the pitch, or frequency, lowers. 20) What type of waves move energy forward, but the source moves up and down? medium A) waves particle B) waves C) transverse longitudinal D) waves None of the E) Explanation: The correct answer is transverse waves. Longitudinal waves move the energy forward and the source also moves parallel to the energy. The other two are made up waves. 21) Light waves do not require a A) medium. can not travel in a B) vacuum. are not electromagnetic C) radiation. do not travel in straight lines D) from the source. None of the E) above Explanation: Light waves do not require a medium. Light waves are electromagnetic radiation and do not require a medium so they can travel through a medium. 22) Why does light refract when it encounters the glass in a lens? because it speeds up, A) causes it to bend because it slows down, which B) causes it to bend because it hits a dense medium, which C) causes it to bounce off because it gets absorbed, causes it to D) lessen in intensity None of the E) above
E) None of the Explanation: As the source moves away, the sound waves stretches out relative to the person standing still; so the pitch drops. Even though the sound waves are being emitted at the same frequency, the distance is not constant; so as the object gets farther and farther away, there appears to be more time between waves to the individual standing still; so the pitch, or frequency, lowers. 20) What type of waves move energy forward, but the source moves up and down? A) medium waves B) particle waves C) transverse D) longitudinal waves E) None of the Explanation: The correct answer is transverse waves. Longitudinal waves move the energy forward and the source also moves parallel to the energy. The other two are made up waves. 21) Light waves A) do not require a medium. B) can not travel in a vacuum. C) are not electromagnetic radiation. D) do not travel in straight lines from the source. E) None of the above Explanation: Light waves do not require a medium. Light waves are electromagnetic radiation and do not require a medium so they can travel through a medium. 22) Why does light refract when it encounters the glass in a lens? A) because it speeds up, causes it to bend B) because it slows down, which causes it to bend C) because it hits a dense medium, which causes it to bounce off D) because it gets absorbed, causes it to lessen in intensity E) None of the above
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