Asound has 13 crests and 15 troughs in 3 seconds. when the second crest is produced the first is 2cm away from the source? calculate

                a. the wavelength

                b. the frequency

                c. the wave speed

The wavelength will be 4 cm, frequency will be 4.66 Hz and wave speed is 18.6 cm/sec

Explanation:

Given:

No. of crest = 13

No. of trough = 15

Time = 3 seconds

Hence, 1 crest or 1 trough =

therefore,

13 C + 15 T =

=

Time given 3 seconds

  =

2 cm distance is travelled is time period

Again wave will travel in 1 T = 4 cm

wave speed v =

=

= 18.6 cm/s

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force