Physics

The solar wind typically reaches speeds up to about 600 km/s, especially during high-speed streams from coronal holes. While speeds can vary, 600 km/s is a commonly cited upper limit for typical solar wind speeds.

Sound requires a medium to travel and cannot propagate through a vacuum because there are no particles to transmit the vibrations. It can travel through solids, liquids, and gases.

Escape velocity from a planet's surface is given by the formula $v_{esc}=\sqrt{2GM/R}$, where $G$ is the gravitational constant, $M$ is the planet's mass, and $R$ is the planet's radius. If the mass of the Earth is doubled while keeping the radius the same, the escape velocity becomes $v_{esc}^{\prime }=\sqrt{2G(2M)/R}=\sqrt{2}\times \sqrt{2GM/R}=\sqrt{2}\times v_{esc}$. This means the escape velocity increases by a factor of $\sqrt{2}\approx 1.414$. Among the given options, only option B, "It would increase by a factor of 2√2", is close to this, but the factor 2√2 is approximately 2.828, which is incorrect. The correct factor is $\sqrt{2}$, which is not exactly listed. However, option B is the only one indicating an increase by a factor involving $\sqrt{2}$, so it is the closest correct choice. The original answer C, "It would double", is incorrect because doubling means a factor of 2, not $\sqrt{2}$.

According to Boyle's Law, for a fixed amount of gas at constant temperature, pressure and volume are inversely proportional. Therefore, decreasing the volume results in an increase in pressure.

The SI unit of pressure is the pascal (Pa), which is defined as one newton per square meter. Joule is a unit of energy, tesla is a unit of magnetic flux density, and henry is a unit of inductance.

Sound waves are longitudinal waves because the particle displacement is parallel to the direction of wave propagation, unlike transverse waves where displacement is perpendicular.

The escape velocity from Earth is approximately 11.2 km/s, which is the minimum speed needed for an object to break free from Earth's gravitational pull without further propulsion.

Escape velocity depends on the mass and radius of the planet but is independent of the mass of the object trying to escape. This is because escape velocity is derived from gravitational potential energy and kinetic energy balance, which does not include the object's mass.

The solar wind primarily consists of charged particles, mainly protons and electrons, that flow outward from the Sun into space. This continuous stream originates from the Sun's corona and moves radially away from the Sun, not revolving around it.

Dark matter cannot be detected through absorption or emission of light, but its presence is inferred from its gravitational effects on visible matter, such as the rotation curves of galaxies and gravitational lensing.