Please solve this in notebook and send please
2 answers:
Answer:
Explanation:
The maximum displacement of a particle from its mean position in a wave is called amplitude of a wave. It occurs at crest and trough in a transverse wave and at compression and rarefaction in a longitudinal wave. It's SI unit is ' m '.
The time taken by a wave to travel complete one cycle of a complete wave is called time period. It's unit is second. For example : if a sound wave takes two seconds to complete one cycle , it's time period is two seconds.
The number of complete waves , set up in a medium in one second is called frequency of the wave. The SI unit of frequency is hertz ( Hz ). For example , if a sound wave completes 15 compressions and 15 rarefactions in one second , it's frequency is 15 Hz. Kilohertz ( KHz ) and megahertz ( MHz ) are the higher units of frequency.
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Answer:
- k = 167.33 N/m
Explanation:
- The radio waves have a fixed relationship between the propagation speed (the speed of light in vacuum), the frequency and the wavelength, as follows:
- v = c = λ*f
where c= speed of light in vacuum = 3*10⁸ m/s, λ = wavelength =
4.92*10⁷ m.
Solving for f, we get the frequency of the radio waves:
f = 6.1 Hz
- Now, from the Hooke's law, we know that the mass attached at the end of the spring oscillates with an angular frequency defined by a fixed relationship between the spring constant k and the mass m, as follows:
- Now, we know that there exists a fixed relationship between the angular frequency and the frequency, as follows:
- We also know that f in (2) is the same that we got for the radio waves, so replacing (2) in (1), and rearranging terms, we can solve for k, as follows: