Compound or a simple element.
For example O2 is a chemical formula and represents the element oxigen, because it exists as a diatomic molecule in the air.
NaCl is a chemical formula and represents sodium chloride
CH4 is a chemical formula and represents methane.
Answer:
Polar bears (Ursus maritimus) are of special interest because of their large size, white color and position as the top-level carnivore in the remote arctic environment. They occur only in the northern hemisphere nearly always in association with sea ice. They have only two colors of fur: tan and white. Polar bears were created to withstand cold temperatures and are quite adaptable. Polar bears are ferocious and the most dangerous of bears. They can lop a person's head off with one swoop of their paw.
Answer:
When object is placed between the focus (F) and pole (P) of a concave mirror, magnified and erect image of the object is formed on the back of the mirror.
When object is placed between the centre of curvature and the principal focus of a concave mirror, magnified and inverted image is formed in front of the mirror.
Explanation:
<h2>Answer:</h2>
The refractive index is 1.66
<h2>Explanation:</h2>
The speed of light in a transparent medium is 0.6 times that of its speed in vacuum
.
Refractive index of medium = speed of light in vacuum / speed of light in medium
So
RI = 1/0.6 = 5/3 or 1.66
Answer:
26
Explanation:
Total power of the circuit
P = V × I = 120 × 20 = 2400 W
Power of each bulb = 90 W
Number of bulbs which work without tripping
N = power of circuit / power of each bulb
N = 2400 / 90
N = 26.66
Number of bulbs should be integer so the number of bulbs be 26.
