10 most difficult physics riddles A list of ten (out of 72) physics related questions that are the most often answered incorrectly Physics quiz The speed to let the rocket enter the orbit is ...VI = 7,91 km/s. And cosmic velocity - also referred to as the circular velocity, it is the speed that should be given to the body to enter into orbit around Earth.very hard 15% vI = 7,91 km/svI = 7,91 km/s15%vII = 11,19 km/svII = 11,19 km/s35%vIII = 16,7 km/svIII = 16,7 km/s15%Depends on the weight of the rocketDepends on the weight of the rocket34%Created by: Tschuka . Statistics based on 4087 answers in 2 languages »weapons riddles » In which layer of the atmosphere the aurora is created?In the Thermosphere. Auroras are produced when the magnetosphere is sufficiently disturbed by the solar wind that the trajectories of charged particles in both solar wind and magnetospheric plasma, mainly in the form of electrons and protons, precipitate them into the upper atmosphere (thermosphere/exosphere) due to Earth's magnetic field, where their energy is lost. very hard 17% In the TroposphereIn the Troposphere22%In the StratosphereIn the Stratosphere38%In the mesosphereIn the mesosphere21%In the ThermosphereIn the Thermosphere17%Created by: Tschuka . Statistics based on 695 answers in 2 languages »atmosphere riddles » What is the name of the most radioactive isotope on the planet?Polonium 210. 210Po is extremely toxic, with one microgram being enough to kill the average adult (250,000 times more toxic than hydrogen cyanide by weight).210Po was used to kill Russian dissident and ex-FSB officer Alexander V. Litvinenko in 2006,very hard 19% Rad 226Rad 22615%Uranus 235Uranus 23541%Polonium 210Polonium 21019%plutonium 244plutonium 24423%Created by: Tschuka . Statistics based on 409 answers in 2 languages »chemical elements riddles » What is the name of the wind measuring device?Anemometer. An anemometer is a device used for measuring the speed of wind, and is also a common weather station instrument. The term is derived from the Greek word anemos, which means wind, and is used to describe any wind speed measurement instrument used in meteorology. very hard 20% DynamometerDynamometer19%PedometerPedometer8%HydrometerHydrometer50%AnemometerAnemometer20%Created by: Tschuka . Statistics based on 1378 answers in 2 languages »measures riddles » What does synthesis gas (water gas) consist of?Carbon monoxide (CO) and hydrogen (H2). Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. Synthesis gas is a useful product, but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. The water-gas shift reaction can be used to reduce the carbon monoxide while producing additional hydrogen, resulting in water gas. very hard 21% oxygen (O2) and hydrogen (H2)oxygen (O2) and hydrogen (H2)22%methane (CH4) and water (H2O)methane (CH4) and water (H2O)32%carbon dioxide (CO2) and hydrogen (H2)carbon dioxide (CO2) and hydrogen (H2)24%carbon monoxide (CO) and hydrogen (H2)carbon monoxide (CO) and hydrogen (H2)21%Created by: Tschuka . Statistics based on 2941 answers in 2 languages »water riddles » Saffir-Simpson scale is used to measure ...Hurricane force. Officially, the Saffir–Simpson hurricane wind scale is used only to describe hurricanes forming in the Atlantic Ocean and northern Pacific Ocean east of the International Date Line. Other areas use different scales to label these storms, which are called "cyclones" or "typhoons", depending on the area.very hard 22% Speed supersonic jetsSpeed supersonic jets9%Shock wave at nuclear explosionShock wave at nuclear explosion50%Hurricane forceHurricane force22%Thunderbolt forceThunderbolt force17%Created by: Tschuka . Statistics based on 136 answers in 2 languages »weather riddles » Which type of transmission uses the shortest waves?Satellite TV. The Ku band is the portion of the electromagnetic spectrum in the microwave range of frequencies from 12 to 18 gigahertz (GHz). Ku band is primarily used for satellite communications, most notably for fixed and broadcast services, and for specific applications such as NASA's Tracking Data Relay Satellite used for both space shuttle and International Space Station very hard 23% GSM telephonyGSM telephony15%CB radioCB radio34%VHF radioVHF radio25%satellite TVsatellite TV23%Created by: Tschuka . Statistics based on 4011 answers in 2 languages »TV riddles » What disease does stephen hawking have?Lou Gehrig's disease ALS. Hawking has a rare early-onset, slow-progressing form of amyotrophic lateral sclerosis (ALS) that has gradually paralysed him over the decades. He now communicates using a single cheek muscle attached to a speech-generating device.very hard 25% Balo concentric sclerosisBalo concentric sclerosis9%Multiple Sclerosis MSMultiple Sclerosis MS39%Creutzfeldt-Jakob disease CJDCreutzfeldt-Jakob disease CJD25%Lou Gehrig's disease ALSLou Gehrig's disease ALS25%Created by: Tschuka . Statistics based on 174 answers in 2 languages »medicine riddles » What is the name of the phenomenon of faster freezing of warmer water than colder water?Mpemba effect. The Mpemba effect, is the observation that, in some circumstances, warmer water can freeze faster than colder water. There have been reports of similar phenomena since ancient times, although with insufficient detail for the claims to be replicated.very hard 25% Mpemba effectMpemba effect25%Phenomenon of LeidenfrostPhenomenon of Leidenfrost43%Wulff processWulff process12%Maxwell's vitrificationMaxwell's vitrification17%Created by: Tschuka . Statistics based on 139 answers in 2 languages »discoverers riddles » Who discovered radioactivity?Henri Becquerel. Antoine Henri Becquerel (15 December 1852 – 25 August 1908) was a French physicist, Nobel laureate, and the first person to discover evidence of radioactivity. For work in this field he, along with Marie Skłodowska-Curie and Pierre Curie, received the 1903 Nobel Prize in Physics. The SI unit for radioactivity, the becquerel (Bq), is named after him.very hard 26% Henri BecquerelHenri Becquerel26%Max PlanckMax Planck8%Ernest RutherfordErnest Rutherford27%Maria Skłodowska-CurieMaria Skłodowska-Curie37%Created by: Tschuka . Statistics based on 358 answers in 2 languages »discoveries riddles » Play physics quiz and see all the questions.