Modelová Otázka ID 3576 - 
Co lze říct o elektromagnetickém vlnění šířícím se ve vakuu o vlnové délce 400 nm?
Správná odpověď je: B, C
Vlnová délka 400 nm přibližně odpovídá fialovému světlu. Pro frekvenci světla platí vztah 
, kde λ je vlnová délka a v je rychlost šíření v daném prostředí. Frekvence světla o této vlnové délce je:
f = 300 000 000 m · s–1 / 400 · 10–9 m = 300 · 106 m · s–1 / 400 · 109 m = 0,75 · 1015 s–1 = 7,5 · 1014 Hz.
| Cookie | Délka | Popis |
|---|---|---|
| _fbp | 3 months | Facebook sets this cookie to display advertisements when either on Facebook or on a digital platform powered by Facebook advertising after visiting the website. |
| _ga | 1 year 1 month 4 days | Google Analytics sets this cookie to calculate visitor, session and campaign data and track site usage for the site's analytics report. The cookie stores information anonymously and assigns a randomly generated number to recognise unique visitors. |
| _ga_* | 1 year 1 month 4 days | Google Analytics sets this cookie to store and count page views. |
| sbjs_current | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_current_add | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_first | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_first_add | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_migrations | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_session | 1 hour | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| sbjs_udata | session | Sourcebuster sets this cookie to identify the source of a visit and stores user action information in cookies. This analytical and behavioural cookie is used to enhance the visitor experience on the website. |
| Cookie | Délka | Popis |
|---|---|---|
| lp_session_guest | 2 days | Description is currently not available. |
| uloha_switch | 1 day | Description is currently not available. |
