Sound waves transmit 2000 J of energy through area of 10m2 in 5 sec, the intensity of sound in watt/m2 is?

Question

a) 8 b) 4 c) 40 d) 16
please with explanation!

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Answer 1 · 2018-04-08T03:33:44

#"c) 40 Watt/m"^2#

Intensity #("I")# is given as

#"I" = "P"/"A"#

where,

#"P ="# Power

#"A ="# Area

#"I" = ("2000 J"/"5 s")/("10 m"^2) = "400 Watt"/("10 m"^2) = "40 Watt/m"^2#