<h2><u>Q</u><u>u</u><u>e</u><u>s</u><u>t</u><u>i</u><u>o</u><u>n</u>:-</h2>
The speed of a wave is 40 m/s. If the wavelength is 80 centimeters, what is the frequency of the wave ?
<h2><u>A</u><u>n</u><u>s</u><u>w</u><u>e</u><u>r</u>:-</h2>
<h3>Given:-</h3>
Velocity (V) = 40 m/s
Wavelength 
= 80 cm = 0.8 m
<h3>To Find:-</h3>
The frequency (F) of the wave.
<h2>Solution:-</h2>
We know,
40 = F × 0.8
F = 
F = 50
<h3>The frequency of the wave is <u>5</u><u>0</u><u> </u><u>H</u><u>z</u>. [Answer]</h3>
Answer:
A: Opposite
Explanation:
From Newton's third law of motion, to every action there is an equal an opposite reaction. Thus, when the wave hits a fixed boundary, it is returned as a reflected wave to the starting point albeit on the other side.
Answer: Convention
Explanation: Convention is pretty well known for being a process that transmits heat from one place to another place with the movements of heated particles. I got this answer from my notebook during my chemistry class.
Hope this answer helps!
Yeah that’s how i feels better now tho haha it’s all okay cool tho haha it’s cool cool bro bro yeah bro lol lol bro bro lol lol yeah yeah that’s okay good lol
Answer:
proper time taken by the person is 9.911 × 10⁻⁵ s
Explanation:
speed of the person in x- direction = 40,000 km/s
= 40,000 × 10³ m/s
= 4 × 10⁷ m/s
when the person just passes the street lamp is switched on which is at x =4 km
Lorentz factor = 
= 
= 1.009
time taken in your frame of reference,t =
=
proper time =
hence, proper time taken by the person is 9.911 × 10⁻⁵ s
