Does sound travel faster in a warm room or a cold room? Explain your answer.
Answer: Sample Response: Sound travels faster in a warm room because temperature affects the speed of a wave. In a warm room, the particles of air move faster and have higher chances of bumping into each other, which then increases the instances of energy transfer.
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How does the speed (in a vacuum) of a high-frequency electromagnetic wave compare with a low-frequency electromagnetic wave?
A) the lower-frequency wave has the higher speed because speed is inversely related to frequency B) the two waves have the same speed because the speed of light is constant C) the lower-frequency wave has the higher speed because it has the longest wavelength D) the higher-frequency wave has the higher speed
How much water at 20 degrees Celsius is needed to melt 500 grams of ice at 0 degree Celsius?
a. 500 grams b. 1000 grams c. 1500 grams d. 2000 grams
If a convex lens were made out of very thin clear plastic filled with air, and were then placed underwater where n = 1.33 and where the lens would have an effective index of refraction n = 1, the lens would act in the same way
A. as a concave mirror in air. B. as a concave lens in air. C. as a convex lens in air. D. as a flat refracting surface between water and air as seen from the water side. E. as the glasses worn by a farsighted person.
When a bar magnet is thrust at the same speed into a coil having twice the number of loops, the induced voltage is
A) half. B) the same, no different. C) twice as much. D) four times as much. E) none of the above