Mehapatel

The object is at a height of 4 m.

Formation of 2-Bromopropane: Addition to HBr to propene is an ionic electrophilic addition reaction in which the electrophile, (H+) adds to form a more stable 2° carbocation. In the 2nd reaction, the carbocation is rapidly attacked by the nucleophile (Br-) to form 2-bromopropane.
Formation of 1-Bromopropane:In the presence of benzoyl peroxide, the addition of HBr to propene involves free radical mechanism in which Br-free radical is obtained by the action of benzoyl peroxide on HBr.
(i) Br radical adds to propene to form the more stable 2° free radical.(ii) Free radical thus obtained rapidl

Answer :- Bhopal

(i)           Acetone undergoes clemmensen reduction in presence of zinc amalgam and conc.HCl to give propane.
 
(ii)          Acetone reacts with semicarbazide to form semicarbazone.
 
(iii)        Acetone reduces to form tertiary alcohol in the presence of Grignard reagent.
 
(b) Due to extensive hydrogen bonding, carboxylic acid has the highest boiling points an among the given compound. Alcohols, with a smaller number of the hydrogen bond, have a lesser boiling point. Aldehydes have least boiling point due to the absence of hydrogen bonding.
Hence the order of boiling point is:
CH

The possibilities are:6 on the first draw.The sample space,   or 6 on the second draw, the sample space for which is:                             or 6 on the third draw, the sample spae for which is                             {(1,1,6), (1,2,6), (1,3,6), (1,4,6), (1,5,6), (2,1,6), (2,2,6), (2,3,6), (2,4,6), (2,5,6) (3,1,6), (3,2,6), (3,3,6), (3,4,6), (3,5,6), (4,1,6), (4,2,6), (4,3,6), (4,4,6), (4,5,6), (5,1,6), (5,2,6), (5,3,6), (5,4,6), (5,5,6)}and so on,Hence, the sample space is:                     S = {(6), (1,6), (2,6), (3,6), (4,6), (5,6), (1,1,6), (1,2,6), (1,3,6), (1,4,6), (1,5,6),

The Roman social structure:1. Tacitus described the leading social groups of the early empire as follows: senators (patres, lit. ‘fathers’); leading members of the equestrian class; the respectable section of the people, those attached to the great houses; the unkempt lower class (plebs sordid) who, he tells us, were addicted to the circus and theatrical displays; and finally the slaves.
In the early third century when the Senate numbered roughly 1,000 approximately half of all senators still came from Italian families.
2. By the late empire, which starts with the reign of Constantine I in

(i) p-nitro aniline

Here, Δ T1 = 110-100 = 10o C As the rate of heat flow is directly proportional to the temperature difference and the temperature difference in both the cases is same i.e. 10o C. So, the same rate of heat will flow in the second case. Hence,

Let AC be the tower and BE be the building. Let height of the tower be h m. It is given that the angles of depression of the top C and bottom A of the tower, observed from top of the building be 30° and 60° respectively.In right triangle CDE, we haveIn right triangle ABE, we haveComparing (i) and (ii), we getHence, the height of the tower is 40 m.

Parasympathetic neural signal reduces both heart rate and cardiac output, through the postganglionic fibres. These fibres are very short and are cholinergic in nature.

The excess pressure inside the soap bubble is inversely proportional to the radius of soap bubble i.e. P ∝1/r, r being the radius of the bubble. It follows that pressure inside a smaller bubble is greater than that inside a bigger bubble. Thus, if these two bubbles are connected by a tube, air will flow from smaller bubble to bigger bubble and the bigger bubble grows at the expense of the smaller one.

Intensity of light = K units Phase difference corresponding to λ is 2π and phase difference corresponding to λ/3 is 2π/3. Now, using the formula of intensity,               I = I1+I2+2I1I2 cos ϕ Let, I1 = I2 = I0                       In the first case, when path difference is λ.              K = I0+I0+2I0 cos 2π = 4I0 In the second case, when path difference is λ3             K  = I0+I0+2I0cos2π3                 = I0+I0-2I012 = I0 Now, K K = I04I0 =14  =  K  = K4 Therefore, intensity is one-fourth of it s initial value when path difference is λ/3.                       .
 

The arc of length l = AB of a sector of angle 45° in a circle of radius 7 cm is given by Perimeter of sector (OAB)= OA + OB + arc AB= (7 + 7 + 5.5) cm = 19.5 cm

Solved Questions Answers and Assignments for STD 9 સંસ્કૃત સંસ્કૃત ધોરણ 9 Study Notes for GCERT Textbooks Available online.

The electric field lines of the point charge are as given below:

'तुफानो की और' कविता में कवि 'सुमन' ने बताया है की यह संसार एक सागर है और हरेक मनुष्य अपने जीवनरूपी नाव का नाविक है | संसार में तुफानो - कठिनाइयों की कमी नहीं है | मनुष्य का कर्तव्य है की वह उन कठिनाइयों में अपना धैर्य न खोए और साहस से उनका सामना करे | कठिनाइयों में ही मनुष्य के साहस, बल और बुद्धि की परीक्षा होती है | इसलिए वह कठिनाइयों का स्वागत करे और उन पर विजय प्राप्त करे |   

The equation of circle is                                         ...(1)The equation of line is                      y = x                                  ...(2)From (1) and (2), we get                          circle (1) and line (2) meet in P(4, 4)Radius OA of circle  = Required area = Area OAP                       = Area of  + area MAP                                                          ...(1)where                    

For 10o rise in temperature, n = 1so rate = 2n = 21 = 2When temperature is increased from 10oC to 100o C change in temperature = 100-10 = 90oC i.e n=9 so, rate = 29 = 512 times.Alternate method: With every 10o C  rise in temperature, rate becomes double, so 

Given, a solenoid.Number of turns per unit length,n = 15 turns/cm = 1500 turns/m Area of the small loop, A = 2 cm2 = 2 x 10–4 m2Initial current, I1 = 2AFinal current, I2 = 4AΔt = 0.1sThe magnetic field associated with current I1,                     B1 = μ0 n I1 The magnetic field associated with current I2,                     B2 = μ0 n I2 The change in flux assosciated with change in current in solenoid, ∆ϕ = (B2-B1) A         = 4π×10-7×1500 × (4-2) × 2 × 10-4     = 7.6 × 10-7 weberThe induced EMF while current is changing,                    E = ∆ϕ∆t       = 7.6 × 10-70.1      = 7.6 × 10-6

Endurance can be defined as the ability to withstand stress over prolonged periods of time. An endurance sport is therefore any sport in which there is a prolonged physical stress.
Types of endurance:According to the nature of activity, the endurance is classified into following types:
Basic Endurance- Also known as aerobic endurance,because basic endurance depends mainly on aerobic endurance.In fact, basic endurance is the ability to perform movements in which large number of body muscles are involved and the activity is performed at slow speed or pace for a long duration.
General Enduran