Lab Superposisi Gelombang
Tumpuk gelombang sinus dan saksikan mereka berinterferensi, melayang, dan diam — semuanya berdasarkan persamaan gelombang v = f·λ.
Ini adalah superposisi gelombang yang tepat — setiap titik adalah jumlah gelombang komponen, tanpa selubung palsu. Pilih prasetel atau tambahkan gelombang Anda sendiri, lalu atur amplitudo, panjang gelombang, frekuensi, dan fase. Gelombang identik yang sefase saling menggandakan (konstruktif), fase berlawanan saling meniadakan (destruktif), dua frekuensi berdekatan menghasilkan layangan, dan dua gelombang berlawanan arah membeku menjadi gelombang berdiri.
Prasetel
Sistem
Gelombang terpilih
Ketuk cip gelombang di kanvas untuk membaca amplitudo, panjang gelombang, frekuensi, periode, k, ω, dan v = f·λ — serta menyesuaikannya secara langsung.
Rumus & sumber
y(x,t) = Σ Aᵢsin(kᵢx − ωᵢt + φᵢ)
v = fλ · k = 2π/λ · ω = 2πf
beat = |f₁ − f₂|
node spacing = λ/2
The units and constants behind these waves
One equation, v = f·λ, ties a wavelength you measure in metres to a frequency you count in hertz. Both of those units are defined by fixed constants, so every wave reading here is really a comparison against caesium and the speed of light.
What you are changing
The two constants under v = f·λ
The same equation, from a piano note to red light
| Wave | Frequency | Wave speed | Wavelength |
|---|---|---|---|
| Concert A on a piano | 440 Hz | 343 m/s | 0.780 m |
| The top of human hearing | 20 kHz | 343 m/s | 17.1 mm |
| FM radio | 100 MHz | 299,792,458 m/s | 3.00 m |
| Wi-Fi | 2.4 GHz | 299,792,458 m/s | 0.125 m |
| Red light | 430 THz | 299,792,458 m/s | 697 nm |
Wavelengths are computed live as λ = v/f. Sound uses 343 m/s (dry air at 20 °C); radio and light use the exact speed of light from our constants page.
A frequency reading is a count against caesium
Since 1967 the second has been defined by fixing the caesium-133 hyperfine transition at exactly 9 192 631 770 Hz. A hertz is one cycle per second — so when this lab shows 2 Hz, it means two cycles for every 9 192 631 770 caesium oscillations.
See the seven defining constants →