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mukesh
Questions (9)
It is said that happy and healthy workers are efficient and productive. A company that manufactures exercising machines wanted
0 answers
504 views
Find the equation to the cone whose vertex is the point (a,b,c) and whose generating lines
intersects the conic px2 + qy2 = 1, z
3 answers
3,331 views
Find the projection of the line 3x – y +2z – 1 = 0, x +2y – z = 2 on the plane 3x + 2y +z = 0.
3 answers
1,247 views
we did not grow rice voice
1 answer
518 views
A girl walks 12 km at the speed of 3 km/h. what change should she make in her speed to take (i) an hour less and (ii) an hour
3 answers
1,878 views
ABCD is a parallelogram. L and M are points on AB and DC respectively and AL=CM. Prove that LM and BD bisect each other.
2 answers
1,402 views
in a class 1/3 of students play cricket 1/8 play volleyball, 1/6 play tennis and the rest don't play any games. what fraction of
2 answers
1,870 views
if A+B=45 degree show that (cos A-1)(cotB-1)=2.
0 answers
424 views
The perimeter of a rectangle is 68 f. Find the dimensions of the rectangle if the ratioof the length to the width is 9:8
I am
0 answers
633 views
Answers (1)
we know that energy in nth level is (hc/lemda),here denote lemda=l so E=E1-E2=2.4ev E=E1-E2=hc/l; put the value of "h and c" {1ev=1.6*10^-19j} 2.4*1.6*10^-19 =(6.64*10^-34 *3*10^8)/l l=5.187*10^-7m=518.7nm so answer is (d)
