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Questions and Answers
In the given displacement-time graph, which note is louder and which note has a higher pitch?
In the given displacement-time graph, which note is louder and which note has a higher pitch?
- II - Higher pitch, I - Louder
- I - Louder, II - Higher pitch
- I - Higher pitch, II - Louder
- II - Louder, I - Higher pitch (correct)
What problem do mountaineers often encounter when they reach high altitudes?
What problem do mountaineers often encounter when they reach high altitudes?
- Nose bleeding (correct)
- Dizziness
- Frostbite
- Shortness of breath
Why do mountaineers often encounter nose bleeding when they reach high altitudes?
Why do mountaineers often encounter nose bleeding when they reach high altitudes?
- The increased oxygen concentration at high altitudes directly affects the blood vessels in the nose.
- The blood pressure of their body becomes much less than the atmospheric pressure, making the blood vessels burst. (correct)
- The low temperature at high altitudes causes the blood vessels in the nose to contract and burst.
- The blood pressure of their body becomes much higher than the atmospheric pressure, causing the blood vessels to burst.
