An element X has the 4th shell as the valence shell. If the difference in the number of electrons between K and N shells and between L and M shells is zero, then the atomic number of the element X will be
it would be (d) because if 4 shells are present in an atom then rest of the answers don't make sense !!!!
Which of the following statements are correct?
1. Vitamin A helps to make our bones and teeth strong.
2. Iron helps in the formation of blood.
3. Potassium is present in sprouts and bananas.
4. Vitamin D helps in wound healing and found in whole grains.
A 1 and 3 only
B 2 and 3 only
C 3 and 4 only
D 2 and 4 only
Rahul gets an assignment to make a list of fabrics made of different fibres. He takes pieces of fabric X and Y and burns them to identify the fibre. Fibre X burns with smell of charred meat and fibre Y burns with smell of burning hair. Identify the fabrics X and Y.
ans is B
Digit at the tens place in the number that comes as a difference between 5 hundreds 6 tens 13 ones and 7 hundreds 2 tens 15 ones is _________.
can anyone explain this solution
Two satellites S1 and S2 revolve around a planet in coplanar circular orbits in the same sense. Their periods of revolution are 1 h and 8 h respectively. The radius of the orbit of S1 is 104 km. When S2 is closest to S1, then the speed of S2 relative to S1 will be
Aπ × 104 km h-1
B2π × 104 km h-1
C1 × 104 km h-1
D2 × 104 km h-1
could anyone give me a detailed solution for this?