Answer:
It is a chemical change.
Explanation:
When the electricity is off, the filament cools down to its original physical state. This physical process repeats every time the light is turned on and off. However, if the bulb is cracked and air is introduced, the oxygen in the air reacts with the tungsten filament which then undergoes a chemical change.
Answer:
the number of valence electrons is equal to the atom's main group number
Explanation:
Answer:
Penta hydrogen chlorine
Explanation:
they are ploy atomic elements
Answer:
4.85 x 10⁻¹⁹J
Explanation:
Given parameters:
Wavelength = 410.1nm
Unknown:
The energy of the violet light = ?
Solution:
The energy of a wave can be derived using the expression below;
E =
h is the planck's constant
c is the speed of light
Insert the parameters and solve;
E =
= 4.85 x 10⁻¹⁹J