Answer: The wave can flip upside down.
Reflection is the bending of a wave when it cannot pass through. For example, plain mirrors which are flat, a ray of light hits the mirror and is reflected from the mirror since it cannot pass through
When reflection occurs the speed and frequency of the wave does not change but the wave is flipped upside down.
The speed does not change because speed is affected by the change in medium the frequency also remains the same since the energy of the wave does not change.
Answer:
0.480 seconds
Explanation:
The period is the time for 1 revolution. Writing a proportion:
14.4 s / 30.0 rev = t / 1 rev
t = 0.480 s
The period is 0.480 seconds.
Answer:
Explanation:Advatages
1..Its takes precise reading accurate
2. it is moveable because of its small weight
3.It is easy to read and can be kept inside water
Disadvantages
1. It breaks easily because of its small size
2. If broken there can be risk of exposure to mercury chemicals.
Answer:
511797.76 eV
Explanation:
Mass of electron = Mass of positron = 9.11×10⁻³¹ kg
Mass of annihilation
Δm = Mass of electron + Mass of positron
⇒Δm = 9.11×10⁻³¹+9.11×10⁻³¹
From Einstein's Equation

1 eV = 1.602 × 10⁻¹⁹ J

Energy of each photon is

∴ Energy of each of the two photons produced in an electron-positron annihilation is 511797.76 eV