A crying baby emits sound with an intensity of 8.0 × 10-8 W/m2. Calculate a reasonable estimate for the intensity level from a set of quintuplets (five babies), all crying simultaneously at the same place?
The lowest detectable intensity is 1.0 × 10-12 W/m2.
A) 79 dB
B) 69 dB
C) 56 dB
D) 49 dB
E) 36 dB
C
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A 6.5-g iron meteor hits the earth at a speed of 295 m/s. If its kinetic energy is entirely converted to heat in the meteor, by how much will its temperature rise? The specific heat of iron is 113 cal/kg ? C°, and 1 cal = 4.186 J
A) 92.0 C° B) 57,100 C° C) 0.147 C° D) 384 C°
Given 30. ?H and a 60. ? resistor, what range of capacity allows tuning this series circuit to the FM band (88-108 MHz)?
What will be an ideal response?
What causes the changing dark and light features visible on the Martian surface from Earth?
A) seasonal growth of vegetation B) the flooding of the network of canals from seasonal polar ice melting C) lava fields, similar to those found on the Moon D) highly cratered and eroded areas that are frequently covered and uncovered by dust E) huge storms like those on Jupiter with winds that often reach speeds of hundreds of kilometers per hour
What are Apollo asteroids?
What will be an ideal response?