What is the wavelength of an earthquake wave if it has a speed of 15 km/s and a frequency of 12 hz?

Explanation:

The velocity of a wave is given by:

  (1)

Where:

 is the wavelength of the wave

is the frequency of the wave. Its unit is Hertz ()

So, we have to find  from equation (1):

  (2)

Finally we obtain the wavelength of the earthquake wave:

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explanation:

i'm only doing this the points

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation: