For kerosene, n = 1.44 For turpentine, n = 1.47 For water, n = 1.33 Because water has the lowest refractive index, therefore light travels fastest in this optically rarer medium than kerosene and turpentine oil.
For kerosene, n = 1.44
For turpentine, n = 1.47
For water, n = 1.33
Because water has the lowest refractive index, therefore light travels fastest in this optically rarer medium than kerosene and turpentine oil.
From table 10.3, diamond has highest refractive index (= 2.42), so it has highest optical density. Air has lowest refractive index (= 1.0003), so it has lowest optical density.
From table 10.3, diamond has highest refractive index (= 2.42), so it has highest optical density.
Air has lowest refractive index (= 1.0003),
so it has lowest optical density.
Speed of light in vacuum, c = 3 × 10⁸ m s−¹ Refractive index of glass, n = 1.50 Speed of light in the glass, v = c/n = 3×10⁸ m s−¹ Refractive index of glass, n = 1.50 Speed of light in the glass, v= c/n = 3×10⁸/1.50 = 2×10⁸ ms−¹
Speed of light in vacuum, c = 3 × 10⁸ m s−¹
Refractive index of glass, n = 1.50
Speed of light in the glass, v = c/n = 3×10⁸ m s−¹
Refractive index of glass, n = 1.50
Speed of light in the glass, v= c/n = 3×10⁸/1.50 = 2×10⁸ ms−¹
The small numbers of surviving tigers are a cause of worry from the point of view of genetics because in tigers there are negligible genetic variations. Due to this they are not well adapted. The rapid environmental changes cannot be favouable for them. If these changes are not controlled, tigers woRead more
The small numbers of surviving tigers are a cause of worry from the point of view of genetics because in tigers there are negligible genetic variations. Due to this they are not well adapted. The rapid environmental changes cannot be favouable for them. If these changes are not controlled, tigers would be wiped out.
The traits acquired during the life-time are changes in the non-reproductive cells of the organisms and are not capable of being passed on to the next generation.
The traits acquired during the life-time are changes in the non-reproductive cells of the organisms and are not capable of being passed on to the next generation.
Different ways in which individuals with a particular trait may increase in a population are as follow : If it gives the benefit of survival through natural selection. Due to a sudden increase in a particular trait in a population, i.e., by genetic drift.
Different ways in which individuals with a particular trait may increase in a population are as follow :
If it gives the benefit of survival through natural selection.
Due to a sudden increase in a particular trait in a population, i.e., by genetic drift.
In mother’s body, the embryo gets nutrition from the mother’s blood. For this, there is a special structure, called placenta. Placenta contains villi. There are empty spaces in mother’s tissues that cover the villi. It provides a large surface area for the transfer of glucose, oxygen and other substRead more
In mother’s body, the embryo gets nutrition from the mother’s blood. For this, there is a special structure, called placenta. Placenta contains villi. There are empty spaces in mother’s tissues that cover the villi. It provides a large surface area for the transfer of glucose, oxygen and other substances from the mother to the embryo.
The various changes occur in girls at puberty are : Hair grow under armpits and pubic region. Mammary glands (or breasts) develop and enlarge. The hips broaden. Extra fat is deposited in various parts of the body like hips and thighs. Fallopian tube, uterus and vagina enlarge. Ovaries start to releaRead more
The various changes occur in girls at puberty are :
Hair grow under armpits and pubic region.
Mammary glands (or breasts) develop and enlarge.
The hips broaden.
Extra fat is deposited in various parts of the body like hips and thighs.
Fallopian tube, uterus and vagina enlarge.
Ovaries start to release eggs.
Menstruation (monthly periods) starts.
Feelings and sexual drives associated with adulthood begin to develop.
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel. (ii) This fluid pRead more
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel.
(ii) This fluid protects the sperms from the acids present in the urethra.
(iii) This fluid provides nutrition to sperms in the form of fructose, calcium and some enzymes.
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3.
For kerosene, n = 1.44 For turpentine, n = 1.47 For water, n = 1.33 Because water has the lowest refractive index, therefore light travels fastest in this optically rarer medium than kerosene and turpentine oil.
For kerosene, n = 1.44
See lessFor turpentine, n = 1.47
For water, n = 1.33
Because water has the lowest refractive index, therefore light travels fastest in this optically rarer medium than kerosene and turpentine oil.
Find out, from Table 10.3, the medium having highest optical density. Also find the medium with lowest optical density.
From table 10.3, diamond has highest refractive index (= 2.42), so it has highest optical density. Air has lowest refractive index (= 1.0003), so it has lowest optical density.
From table 10.3, diamond has highest refractive index (= 2.42), so it has highest optical density.
See lessAir has lowest refractive index (= 1.0003),
so it has lowest optical density.
Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 × 108 m s–1.
Speed of light in vacuum, c = 3 × 10⁸ m s−¹ Refractive index of glass, n = 1.50 Speed of light in the glass, v = c/n = 3×10⁸ m s−¹ Refractive index of glass, n = 1.50 Speed of light in the glass, v= c/n = 3×10⁸/1.50 = 2×10⁸ ms−¹
Speed of light in vacuum, c = 3 × 10⁸ m s−¹
See lessRefractive index of glass, n = 1.50
Speed of light in the glass, v = c/n = 3×10⁸ m s−¹
Refractive index of glass, n = 1.50
Speed of light in the glass, v= c/n = 3×10⁸/1.50 = 2×10⁸ ms−¹
A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?
The light-ray bends towards the normal because the ray of light goes from a rarer medium to a denser medium.
The light-ray bends towards the normal because the ray of light goes from a rarer medium to a denser medium.
See lessWhy are the small numbers of surviving tigers a cause of worry from the point of view of genetics?
The small numbers of surviving tigers are a cause of worry from the point of view of genetics because in tigers there are negligible genetic variations. Due to this they are not well adapted. The rapid environmental changes cannot be favouable for them. If these changes are not controlled, tigers woRead more
The small numbers of surviving tigers are a cause of worry from the point of view of genetics because in tigers there are negligible genetic variations. Due to this they are not well adapted. The rapid environmental changes cannot be favouable for them. If these changes are not controlled, tigers would be wiped out.
See lessWhy are traits acquired during the life-time of an individual not inherited?
The traits acquired during the life-time are changes in the non-reproductive cells of the organisms and are not capable of being passed on to the next generation.
The traits acquired during the life-time are changes in the non-reproductive cells of the organisms and are not capable of being passed on to the next generation.
See lessWhat are the different ways in which individuals with a particular trait may increase in a population?
Different ways in which individuals with a particular trait may increase in a population are as follow : If it gives the benefit of survival through natural selection. Due to a sudden increase in a particular trait in a population, i.e., by genetic drift.
Different ways in which individuals with a particular trait may increase in a population are as follow :
- If it gives the benefit of survival through natural selection.
- Due to a sudden increase in a particular trait in a population, i.e., by genetic drift.
See lessHow does the embryo get nourishment inside the mother’s body?
In mother’s body, the embryo gets nutrition from the mother’s blood. For this, there is a special structure, called placenta. Placenta contains villi. There are empty spaces in mother’s tissues that cover the villi. It provides a large surface area for the transfer of glucose, oxygen and other substRead more
In mother’s body, the embryo gets nutrition from the mother’s blood. For this, there is a special structure, called placenta. Placenta contains villi. There are empty spaces in mother’s tissues that cover the villi. It provides a large surface area for the transfer of glucose, oxygen and other substances from the mother to the embryo.
See lessWhat are the changes seen in girls at the time of puberty?
The various changes occur in girls at puberty are : Hair grow under armpits and pubic region. Mammary glands (or breasts) develop and enlarge. The hips broaden. Extra fat is deposited in various parts of the body like hips and thighs. Fallopian tube, uterus and vagina enlarge. Ovaries start to releaRead more
The various changes occur in girls at puberty are :
- Hair grow under armpits and pubic region.
- Mammary glands (or breasts) develop and enlarge.
- The hips broaden.
- Extra fat is deposited in various parts of the body like hips and thighs.
- Fallopian tube, uterus and vagina enlarge.
- Ovaries start to release eggs.
- Menstruation (monthly periods) starts.
- Feelings and sexual drives associated with adulthood begin to develop.
See lessWhat is the role of the seminal vesicles and the prostate gland?
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel. (ii) This fluid pRead more
(i) Both seminal vesicle and prostate gland secretes fluids which forms a part of the semen. The fluid secreted from seminal vesicle forms 60% of semen while the fluid secreted from the prostate gland forms 30% of the semen. It makes the path smooth through which the sperms travel.
See less(ii) This fluid protects the sperms from the acids present in the urethra.
(iii) This fluid provides nutrition to sperms in the form of fructose, calcium and some enzymes.