78. The Velocity of Sound in moist air is more
than in dry air because the moist air has
a. Less density than dry air
b. Less pressure than dry air
c. More pressure than dry air
d. More density than dry air
79. Who measured the velocity of light first?
Galileo
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Explanation:
ᴛʜᴇ ᴅᴇɴsɪᴛʏ ᴏғ ᴅʀʏ ᴀɪʀ ɪs ᴍᴏʀᴇ ᴛʜᴀɴ ᴛʜᴀᴛ ᴏғ ᴍᴏɪsᴛ ᴀɪʀ (ᴡʜᴇɴ ᴍᴏɪsᴛᴜʀᴇ ɪs ʀᴇᴍᴏᴠᴇᴅ ғʀᴏᴍ ᴀɪʀ, ɪᴛs ᴅᴇɴsɪᴛʏ ɪɴᴄʀᴇᴀsᴇs). ᴛʜᴇ sᴘᴇᴇᴅ ᴏғ sᴏᴜɴᴅ ɪɴ ᴀ ᴍᴇᴅɪᴜᴍ ɪs ɪɴᴠᴇʀsᴇʟʏ ᴘʀᴏᴘᴏʀᴛɪᴏɴᴀʟ ᴛᴏ ᴛʜᴇ sǫᴜᴀʀᴇ ʀᴏᴏᴛ ᴏғ ɪᴛs ᴅᴇɴsɪᴛʏ. ᴛʜᴇʀᴇғᴏʀᴇ, ᴛʜᴇ sᴘᴇᴇᴅ ᴏғ sᴏᴜɴᴅ ɪɴ ᴍᴏɪsᴛ ᴀɪʀ ɪs ᴍᴏʀᴇ ᴛʜᴀɴ ᴛʜᴀᴛ ɪɴ ᴅʀʏ ᴀɪʀ.
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* * ᴀɴs ɪs ᴀ :)
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