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Speed of sound in air is 340 ms−1 and in water 1486ms−1. A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of (a) the reflected sound, (b) the transmitted sound ? Speed of sound in air is 340 ms−1, and in water 1486 ms−1.

101 325 па в бар

Скорость звука 0 °C, 101325 Па = 1 bar

https://ru.wikipedia.org/wiki/Скорость_звука

https://barionleg.github.io/Atom-d3e/index.html

linear gradient css

body {
  width: 100vw;
  height: 100vh;
}
body {
  background: linear-gradient(
    to right,
    white 0% 1%,
    red 8% 14%,
    black 16% 20%,
    orange 22% 28%,
    black 30% 34%,
    yellow 36% 42%,
    green 44%, 50%,
    black 52% 56%,
    Cyan 58% 66%,
    black 68% 72%,
    blue 74% 80%,
    black 82% 86%,
    Indigo 88% 94%,
    white 96% 97%
  );
}

to play with in: https://developer.mozilla.org/fr/docs/Web/CSS/gradient/linear-gradient