The 'normal' speed of sound is 340 m/s in dry air at room temperature and pressure.

From your question, it appears we should differentiate the terms "ultrasonic" and "supersonic".

Ultrasonic relates to sonic frequencies higher than 20 KHz, i.e. beyond audible range. For a given gas, the speed of sound is independent of the frequency of the sound measured and also independent of the density of the gas.

Supersonic relates to a speed of an object greater than the normal speed of sound (340 m/s in air at STP) and usually the phenomena associated with it.

The speed of sound is also a functionof the medium through which it's passing. For example, the speed of sound through water is 1,500 m/s, and is slightly over 5,000 m/s in iron.

So to answer your question, the speed of ultrasound in airis340 m/s for the reasons given.

The good news is, NASA is hiring! They want to get back to the moon by 2024, and they’ll need new astronauts to do it.

The bad news is there are a limited number of jobs, and the qualifications are pretty intense. In addition to a bachelor’s degree, you also must have a master’s degree or two years of PhD work in specific STEM areas. You also qualify if you’re a medical doctor or if you’ve begun or completed a test pilot program. From there, you also need to fit into one of the areas of specialization (two years of biological and medical science, physical science, or engineering and operations work experience, or fit their pilot qualifications).

And of course, you’ll have to be okay with the “extensive travel” required.

The first person to travel in space was Soviet cosmonaut Yuri A. Gagarin (1934-1968). He traveled aboard the Vostok 3KA spacecraft, known as Vostok 1, which was launched April 12, 1961, in a flight lasting one hour and forty-eight minutes.
Yuri Gagarin
Yuri gagarin
Yuri Alekseyevich Gagarin, Hero of the Soviet Union, was a Soviet cosmonaut. On 12 April 1961, he became the first person in space and the first to orbit the Earth. He received many medals from different countries for his pioneering tour in space.

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The first human in space was Yuri Alexeyevich Gagarin on April 12,1961 to orbit the Earth he received medals from around the world.
The first man in space was the Soviet cosmonaut Yuri Gagarin, who made a single orbit of the Earth on April 12, 1961.

The first US astronaut into space was Alan B. Shepard, who made a suborbital flight on May 5, 1961. This was followed by another suborbital flight by Gus Grissom, and by a three-orbit flight by John Glenn on February 20, 1962. The US astronauts were part of NASA's Project Mercury.
Alan B. Shepard; Neil Armstrong was the first to walk on the moon, not to go outside of the atmosphere.
It was Russian astronaut (cosmonatu) Juri Gagarin (pron. Yuriy Gagarin).
Alan Shepard was the first U.S. Astronaut in space.
The first person to travel in space was Soviet cosmonaut Yuri A. Gagarin (1934-1968). His achievement brought prestige to the Soviet Union (USSR). Gagarin orbited the Earth in the spaceship Vostok I, which was launched April 12, 1961, in a flight lasting one hour and forty-eight minutes. The achievement made Gagarin an international hero.
It was Yuri A. Gagarin.
The first man in space was the Russian cosmonaut Yuri Gagarin in his Sputnik spacecraft.
Yuri Gagarin from Russia was the first man to enter space!

Hope it helped! Thanx:D
On 12 April, 1961, the Russian cosmonaut Yuri Gagarin blasted off into orbit in his Vostok 1 spacecraft. He circled the Earth once at an altitude of 320 km (200 miles).

Valentina Tereshkova was the first woman in space
The first human to travel into space was Russian Cosmonaut Yuri Gagarin on the 12th April 1961 when he became the first human in space and the first to orbit the earth.
Soviet cosmonaut Yuri Gagarin was the first human in space, 12 April 1961.

Jenaro Gajardo Vera (*November 18, 1919 in Traiguén, Malleco Province - †May 3, 1998 in Santo Domingo, San Antonio Province) was an eccentric lawyer, painter and Chilean poet. He became famous from September 25 of 1953 until his death, as the legitimate owner of the Moon.

The United Nations 1967 publication "Outer Space Treaty" states space is the "province of all mankind", and is not subject to claims on sovereignty by States. As treaties apply to States and place obligations on States, and since the Space Treaties were drafted at a time when, realistically, the only "people" going into space were States, none of the space treaties make reference to private parties. The Outer Space Treaty of 1967 has currently been ratified by 98 states, including all the major space-faring nations.

The international Moon Treaty, finalised in 1979 and entering into force in 1984, forbids private ownership of extraterrestrial real estate. However, as of January 1, 2008 only 13 states have ratified the agreement, and none of these are major space-faring nations. Kazakhstan has ratified the treaty and is host to the Baikonur Cosmodrome. However, the facility is operated through a leasing agreement by Russia.

There are more space technology spinoffs than people realize, and though most are used in Engineering, Industrial, and Scientific applications, but a few consumer applications that are more well known are:

Lithium Ion Batteries - not originally developed for NASA, but NASA funded further development to power the HST / ISS Pistol Grip Tool. The technology has found its way into the global marketplace.

Solid State Devices (SSD) - SSD technology was developed for the Hubble program. The original recording device on Hubble actually had magnetic recording tapes; the Solid State Recorder, developed in the early 90's and deployed on HST on the 1st Servicing/Repair mission, replaced the old recorder and is the foreunner of SSD devices. SSD technology is widely used today in Flash drives, SSD disk drives, etc.

Tempurpedic Foam (Memory Foam) - The Tempurpedic company is the only one that used NASA's technology for memory foam, using the patented NASA technology through NASA's partnership program. The material was specifically designed for use on Astronaut seats in the Shuttle.

Imaging Technology - CMOS sensor technology, widely used in digital cameras, medical scanners, and many other applications, was further developed for use on the Hubble Telescope. Imaging technology continues to advance as a result.

MARCbot - The MARCbot, currently used by thousands of soldiers in Iraq to locate IED's, was significantly upgraded by NASA engineers, improving its capability, mobility, and cost per unit.

You can view many of the hundreds of spinoffs at NASA's Spinoff site - the link is below.

People visit space for several reasons:

• to study what is there and learn more about our universe
• to travel to new places and explore them
• to learn how to survive in space so that we can travel even further
• because we're just curious about everything!