URGENT: IS1 HELP HELP HELP -please?

Question

Explain and show calculations.
1. Whats the frequency in vibrations per second of a 100 hertz wave?

2. The Sears building sways back and forth at a vibration frequency of about 0.1 Hz. Whats the period of its vibration?

3. A water wave vibrates up and down 2 times each second and the distance between wave crests is 1.5 meters.

a) whats the frequency of the wave?

b) whats the wavelength of the wave?

c) whats the speed of the wave?

4. Whats the wavelength of a 340 Hz sound wave when the speed of sound in air is 340 meters per second?

( period = seconds/cycle , frequency = cycle/second)

hahaha - thank you, but you didnt show work on 3a or 3b...and i need to show work...=[

Answer 1

The hertz (symbol: Hz) is the SI unit of frequency. Its base unit is cycle/s or s^(-1). Please understand this definition and the rest is very easy:
(1) 100 hertz, or 100 vibrations per second.
(2) 0.1 Hz means the period of its vibration is 10s.
(3a) 2Hz
(3b) 1.5m
(3c) 1.5m*2Hz = 3m/s
(4) 340(m/s) / 340Hz = 1m