This diagram shows how loud certain frequencies must be in
order for people of different ages to hear them. The needed
intensity is called the "hearing level."
According to the graph, what is the maximum age at which a
4000 Hz sound wave with an intensity of 20 dB would be
heard?
Hearing Level (dB)
500 Hz
1.000 Hz
2,000 Hz
3,000 Hz
4,000 Hz
-6,000 Hz
70
20
30
60
40 50
Age (Years)

It is reasonable to assume that the bulk modulus of blood is about the same as that of water (2.2 gpa). as one goes deeper and deeper in the ocean, the pressure increases by 10000 pa for every meter below the surface. if a diver goes down 80.0 m in the ocean, by how much does each cubic centimeter of her blood change in volume? give the answer in cubic centimeters (actually one cubic centimeter equals one milliliter).

Ain is , is 's of ? 0.62 0.79 1.27 1.50

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c