Question

light travels with a speed of 3x10 8 m/s how long does the light take to reach the earth from sun which is 1.5×10 11 away

Answer 1

go with the formula... speed = distance / time

Answer 2

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$\huge\fcolorbox{black}{aqua}{Solution:-}$

⛄Question:-

✒ ᴛʜᴇ sᴘᴇᴇᴅ ᴏғ ʟɪɢʜᴛ ɪs 3.0x10^8 ᴍ/s. ʜᴏᴡ ʟᴏɴɢ ᴅᴏᴇs ɪᴛ ᴛᴀᴋᴇ ʟɪɢʜᴛ ᴛᴏ ʀᴇᴀᴄʜ ᴛʜᴇ ᴇᴀʀᴛʜ ғʀᴏᴍ ᴛʜᴇ sᴜɴ, ᴡʜɪᴄʜ ɪs 1.5x10^11ᴍ ᴀᴡᴀʏ?

⛄Answer:-

✒ 500 sᴇᴄᴏɴᴅs

⛄Explanation:-

✒ ᴛʜɪs ϙᴜᴇsᴛɪᴏɴ ᴄᴀɴ ʙᴇ sᴏʟᴠᴇᴅ ᴜsɪɴɢ ᴛʜᴇ ᴄʟᴀssɪᴄ ᴇϙᴜᴀᴛɪᴏɴ ᴏғ ᴍᴏᴛɪᴏɴ: ᴅɪsᴛᴀɴᴄᴇ = ᴠᴇʟᴏᴄɪᴛʏ * ᴛɪᴍᴇ. ᴡᴇ ʜᴀᴠᴇ ᴛᴡᴏ ᴋɴᴏᴡɴ ᴘᴀʀᴀᴍᴇᴛᴇʀs ᴀɴᴅ ᴏɴᴇ ᴜɴᴋɴᴏᴡɴ ᴘᴀʀᴀᴍᴇᴛᴇʀ; ʜᴏᴡᴇᴠᴇʀ, ɪɴ ᴏʀᴅᴇʀ ᴛᴏ sᴏʟᴠᴇ ᴛʜᴇ ᴘʀᴏʙʟᴇᴍ ᴡᴇ ᴍᴜsᴛ ғɪʀsᴛ ʀᴇᴀʀʀᴀɴɢᴇ ᴛʜᴇ ᴇϙᴜᴀᴛɪᴏɴ ᴛᴏ sᴏʟᴠᴇ ғᴏʀ ᴛɪᴍᴇ: ᴛɪᴍᴇ = ᴅɪsᴛᴀɴᴄᴇ / ᴠᴇʟᴏᴄɪᴛʏ.

ᴅɪsᴛᴀɴᴄᴇ = 1.5x10^11ᴍ

ᴠᴇʟᴏᴄɪᴛʏ = 3.0x10^8 ᴍ/s

sᴜʙsᴛɪᴛᴜᴛɪɴɢ ɪɴᴛᴏ ᴛʜᴇ ᴇϙᴜᴀᴛɪᴏɴ:

ᴛɪᴍᴇ = (1.5x10^11ᴍ)/( 3.0x10^8 ᴍ/s) = 500 sᴇᴄᴏɴᴅs

ᴛʜᴇʀᴇғᴏʀᴇ, ʟɪɢʜᴛ ᴛʀᴀᴠᴇʟʟɪɴɢ ᴀᴛ 3.0x10^8 ᴍᴇᴛᴇʀs ᴘᴇʀ sᴇᴄᴏɴᴅ ᴛᴀᴋᴇs 500 sᴇᴄᴏɴᴅs (8 ᴍɪɴᴜᴛᴇs, 20 sᴇᴄᴏɴᴅs) ᴛᴏ ʀᴇᴀᴄʜ ᴛʜᴇ ᴇᴀʀᴛʜ, ᴡʜɪᴄʜ ɪs 1.5x10^11 ᴍᴇᴛᴇʀs ᴀᴡᴀʏ ғʀᴏᴍ ᴛʜᴇ sᴜɴ.

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