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Consider three long straignht parallel wires as shown in figure. THe force the experienced by a 25 cm length of wire C is N X 10^-4 N. Find the value of N?
17
Oct
Consider three long straignht parallel wires as shown in figure. THe force the experienced by a 25 cm length of wire C is N X 10^-4 N. Find the value of N? Consider three long straignht parallel wires as shown in figure. THe force the experienced by a 25 cm length of wire C is [...]
There are two radioactive substances A and B. Decay constant of B is two times that of A. Initially, both have equal number of nuclei. After n half-lives of A, rates of disintegration of both are equal.
17
Oct
There are two radioactive substances A and B. Decay constant of B is two times that of A. Initially, both have equal number of nuclei. After n half-lives of A, rates of disintegration of both are equal. both have equal number of nuclei. After n half-lives of A rates of disintegration of both are equal. [...]
Half-life of a radioactive substance A is two times the half-life of another radioactive substance B. Initially, the number of A and B are NA and NB, respectively. After three half-lives of A,
17
Oct
Half-life of a radioactive substance A is two times the half-life of another radioactive substance B. Initially, the number of A and B are NA and NB, respectively. After three half-lives of A, Half-life of a radioactive substance A is two times the half-life of another radioactive substance B. Initially respectively. After three half-lives of [...]
There are two radio nuclei A and B. A is an alpha emitter and B a beta emitter. Their disintegration constants are in the ratio of 1:2. What should be the ratio of number of atoms of A and B at any time t
17
Oct
There are two radio nuclei A and B. A is an alpha emitter and B a beta emitter. Their disintegration constants are in the ratio of 1:2. What should be the ratio of number of atoms of A and B at any time t 1.00 kg of 235 U undergoes fission process. If energy released [...]
A radioactive substance X decays into another radioactive substance Y. Initially, only X was present. lemda x and lemda y are the disintegration constants of X and Y. Ny will be maximum when
17
Oct
A radioactive substance X decays into another radioactive substance Y. Initially, only X was present. lemda x and lemda y are the disintegration constants of X and Y. Ny will be maximum when A radioactive substance X decays into another radioactive substance Y. Initially only X was present. lemda x and lemda y are the [...]
Two parallel, long wires carry currents i1 and i2 with i1>i2. When the currents are in the same direction, the magnetic field at a point midway between the wires is 10mu T. If the direction of i2 is reversed, the field becomes 30 mu T . The ration i1/i2 is
17
Oct
Two parallel, long wires carry currents i1 and i2 with i1>i2. When the currents are in the same direction, the magnetic field at a point midway between the wires is 10mu T. If the direction of i2 is reversed, the field becomes 30 mu T . The ration i1/i2 is long wires carry currents i1 [...]
1. A survey conducted by an organisation for the cause of illness and death among the women between the ages 15 – 44 (in years) worldwide, found the following figures (in %): S.No. Causes Female fatality rate (%) 1. Reproductive health conditions 31.8 2. Neuropsychiatric conditions 25.4 3. Injuries 12.4 4. Cardiovascular conditions 4.3 5. Respiratory conditions 4.1 6. Other causes 22.0 (i) Represent the information given above graphically. (ii) Which condition is the major cause of women’s ill health and death worldwide? (iii) Try to find out, with the help of your teacher, any two factors which play a major role in the cause in (ii) above being the major cause.
17
Oct
1. A survey conducted by an organisation for the cause of illness and death among the women between the ages 15 – 44 (in years) worldwide, found the following figures (in %): S.No. Causes Female fatality rate (%) 1. Reproductive health conditions 31.8 2. Neuropsychiatric conditions 25.4 3. Injuries 12.4 4. Cardiovascular conditions 4.3 5. [...]
9. A company manufactures car batteries of a particular type. The lives (in years) of 40 such batteries were recorded as follows: 2.6 3.0 3.7 3.2 2.2 4.1 3.5 4.5 3.5 2.3 3.2 3.4 3.8 3.2 4.6 3.7 2.5 4.4 3.4 3.3 2.9 3.0 4.3 2.8 3.5 3.2 3.9 3.2 3.2 3.1 3.7 3.4 4.6 3.8 3.2 2.6 3.5 4.2 2.9 3.6 Construct a grouped frequency distribution table for this data, using class intervals of size 0.5 starting from the interval 2 – 2.5.
17
Oct
9. A company manufactures car batteries of a particular type. The lives (in years) of 40 such batteries were recorded as follows: 2.6 3.0 3.7 3.2 2.2 4.1 3.5 4.5 3.5 2.3 3.2 3.4 3.8 3.2 4.6 3.7 2.5 4.4 3.4 3.3 2.9 3.0 4.3 2.8 3.5 3.2 3.9 3.2 3.2 3.1 3.7 3.4 4.6 [...]
A radioactive isotope is being produced at a constant rate X. Half-life of the radioactive substance is Y. After some time, the number of radioactive nuclei become constant. The value of this constant is
17
Oct
A radioactive isotope is being produced at a constant rate X. Half-life of the radioactive substance is Y. After some time, the number of radioactive nuclei become constant. The value of this constant is A radioactive isotope is being produced at a constant rate X. Half-life of the radioactive substance is Y. After some time [...]
8. Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows: 1 6 2 3 5 12 5 8 4 8 10 3 4 12 2 8 15 1 17 6 3 2 8 5 9 6 8 7 14 12 (i) Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5-10. (ii) How many children watched television for 15 or more hours a week?
17
Oct
8. Thirty children were asked about the number of hours they watched TV programmes in the previous week. The results were found as follows: 1 6 2 3 5 12 5 8 4 8 10 3 4 12 2 8 15 1 17 6 3 2 8 5 9 6 8 7 14 12 (i) [...]