The angle of incidence and the angle of reflection are measured from the_____, the perpendicular to the surface.


Answer 1

I believe it is angles

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Why does the speed of sound depend on air temperature?


A certain temperature can be thick so the speed may take longer to get to it's destination.
The speed of sound is dependent on how close together the molecules of the transmitting medium is.

In a parallel circuit, the current in each branch of the circuit is determined by​



resistances in parallel combination of resistance.

1/Rp = 1/R1 + 1/R2 + 1/R3....

The potential difference will be V.

By applying  Ohm's law,

V = IR

Nuclei of u-238 atoms are


Nuclei of U-238 atoms are unstable and radioactive isotope of uranium . It decays naturally and emits alpha (α) particle.

What is Nuclei of uranium ?

The actinide series includes the metallic, silver-gray element uranium (U). It serves as the primary fuel for nuclear reactors and is also a component of nuclear weapons.

Since uranium has an atomic number of 92, its atomic structure consists of 92 protons and 92 electrons. The nucleus of U-238 contains 146 neutrons, but this number can range from 141 to 146. Due to its radioactivity, uranium constantly emits particles and transforms into new elements.

There is a recognized radioactive decay series for uranium. The most prevalent uranium isotopes are U-238 and U-235 (which has 143 neutrons). All three isotopes of uranium (U-238, 235, and 234) are present in nature, and variations from the typical composition are rarely greater than 0.01%.

Learn more about uranium, refer the link:


 Nuclei of u-238 atoms are unstable and spontaneously emit alpha particles.

Give two ways of reversing the direction of the forces on the coil in the electric motor?​



Interchanging the poles of the magnet

Reversing the direction of the applied current


  1. The working of the electric motor is associated with Fleming's left-hand rule.
  2. It states that if a current-carrying conductor is placed inside a magnetic field, it experiences a force in the direction perpendicular to the direction of the electric current and magnetic field.
  3. These three physical quantities are placed in a mutually perpendicular direction.
  4. So, in order to reverse the direction of force, you have to either change the direction of the current or magnetic field.

Plants are made of_________________cells, which have membrain-bound_____.


Plant cells are eukaryotic cells that differ in several key aspects from the cells of other eukaryotic organisms. number two sry but Idk

What do you think that astronomers mean when they use the term observable universe? (Hint: Thi.nk of the time it takes for light from very distant objects to reach Earth.)


When people use the term "observable universe" it means that the light from other parts of the universe hasn't yet had time to reach us, so we cannot see it.