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7. When a sound source approaches you, the pitch you hear is (1 point) lower when the source is stationary. higher than when the source is stationary. the same as when the source is stationary. first higher and then lower than the pitch of the source when stationary. 8. The part of the ear that sends coded nerve signals to the brain is (1 point) the outer ear. the inner ear. the middle ear. the eardrum. 9. Because light travels in a straight line and casts a shadow, Isaac Newton hypothesized that light is (1 point) radiation. a stream of particles. a wave. heat.

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