What is the radiation pressure on Earth surface?
Answer: (The radiation pressure of sunlight on earth is very small: it is equivalent to that exerted by about a thousandth of a gram on an area of 1 square metre, or 10 μN/m2.) While it acts on all objects, its net effect is generally greater on smaller bodies since they have a larger ratio of surface area to mass.
What are the properties of EM waves Class 12?
- Electromagnetic waves are propagated by oscillating electric fields and magnetic field oscillation at right angles to each other.
- These waves travel with speed 3×108ms−1 in vacuum.
- They are not deflected by electric or magnetic field.
- They can show interference or diffraction.
- They are transverse waves.
Does photon exert pressure?
Photons exert no pressure. Momentum of photon is hvc . Rest mass of photon is zero. (a) : Photons move with velocity of light and have energy hv.
Does a photon have force?
Photons can exert force on matter, a phenomenon known as radiation pressure. However it is not the kinetic energy of a photon which excites atomic electrons into higher orbits.
Can photons push matter?
In addition, light is made of photons which don’t have any mass. The crucial point is that while light doesn’t accelerate, and doesn’t have mass, it does carry momentum and momentum, as a form of energy, can be transferred. By transferring their momentum, photons are able to exert a force on an object.
Why does gravity affect light if it has no mass?
It might be surprising to you to hear that gravity can affect light even though light has no mass. According to general relativity, gravity is actually caused by a curving of space and time. Since light travels in a straight line through straight spacetime, the curving of spacetime causes light to follow a curved path.
What is the slowest recorded speed of light?
38 mph