Answer:
The sound intensity at the position of the microphone is 
Explanation
Sound intensity is given by the formula
Where 
is the sound intensity, 
is the power and 
is the area.
Since the loudspeaker radiates sound in all directions, we have a spherical sound wave where the radius r is the distance of the microphone from the speaker.
∴ is given by 
where 
is the radius
From the question, = 33.0W, = 52.0m
∴ 
Hence, the sound intensity at the position of the microphone is 9.71 × 10⁻⁴ W/m²
Answer:
actually quantity of matter present in a body is its mass.
<span>B. Energy is never created nor destroyed.
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Answer:
Induced emf of the wire is 6.36 Volts.
Explanation:
It is given that,
Length of the wire, l = 75 cm = 0.75 m
Magnetic field, B = 0.53 T
Velocity, v = 16 m/s
The wire is moving straight up in the magnetic field. So, an emf is induced in the wire. It is given by :
So, the induced emf of the wire is 6.36 V. Hence, the correct option is (b) "6.36 V".
