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The diameter of the moon is 3.5 × 10^3 km and its distance from the earth is 3.8 × 10^5 km. It is seen by a telescope having the focal length of the objective and the eye-piece as 4 m and 10 cm respectively. The diameter of the image of the moon will be approximately
12
Sep
The diameter of the moon is 3.5 × 10^3 km and its distance from the earth is 3.8 × 10^5 km. It is seen by a telescope having the focal length of the objective and the eye-piece as 4 m and 10 cm respectively. The diameter of the image of the moon will be approximately [...]
A telescope using light having wavelength 5000 Å and using lenses of focal 2.5 and 30 cm . If the diameter of the aperture of the objective is 10 cm , then the resolving limit and magnifying power of the telescope is respectively
12
Sep
A telescope using light having wavelength 5000 Å and using lenses of focal 2.5 and 30 cm . If the diameter of the aperture of the objective is 10 cm , then the resolving limit and magnifying power of the telescope is respectively A telescope using light having wavelength 5000 Å and using lenses of [...]
A radioactive nucleus undergoes a series of decay according to the scheme: A ⟶ a A 1⟶ β A2 ⟶ α A3 ⟶ γ A4 If the mass number and atomic number of `A’ are 180 and 72 respectively, then the mass number and atomic number for A4 :
12
Sep
A radioactive nucleus undergoes a series of decay according to the scheme: A ⟶ a A 1⟶ β A2 ⟶ α A3 ⟶ γ A4 If the mass number and atomic number of `A’ are 180 and 72 respectively, then the mass number and atomic number for A4 : A radioactive nucleus undergoes a series [...]
In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye piece forms a real image of this line. The length of this image is I. The magnification of the telescope is
12
Sep
In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye piece forms a real image of this line. The length of this image is I. The magnification of the telescope is A simple telescope The light ray is incidence at angle [...]
The normal activity of living carbon-containing matter is found to be about 15 decays per minute for every gram of carbon. Suppose a specimen from Mohenjodaro gives an activity of 9 decays
12
Sep
The normal activity of living carbon-containing matter is found to be about 15 decays per minute for every gram of carbon. Suppose a specimen from Mohenjodaro gives an activity of 9 decays The normal activity of living carbon-containing matter is found to be about 15 decays per minute for every gram of carbon. Suppose a [...]
The focal length of objective and eye lens of a microscope are 4 cm and 8 cm respectively. If the least distance of distant vision is 24 cm and object distance is 4.5 cm from the object lens, then the magnifying power of the microscope will be
12
Sep
The focal length of objective and eye lens of a microscope are 4 cm and 8 cm respectively. If the least distance of distant vision is 24 cm and object distance is 4.5 cm from the object lens, then the magnifying power of the microscope will be The focal length of objective and eye lens [...]
A bottle of red wine is thought to have been sealed about 5 years ago. The wine contains a number of different kinds of atoms, including carbon, oxygen, and hydrogen. Each of these has a radioactive isotope.
12
Sep
A bottle of red wine is thought to have been sealed about 5 years ago. The wine contains a number of different kinds of atoms, including carbon, oxygen, and hydrogen. Each of these has a radioactive isotope. A bottle of red wine is thought to have been sealed about 5 years ago. The wine contains [...]
The number of 238 U atoms in an ancient rock equals the number of 206 Pb atoms. The half-life of decay of 238 U is 4.5 * 10^9 years. Estimate the age of the rock assuming that all the 206 Pb atoms are formed
12
Sep
The number of 238 U atoms in an ancient rock equals the number of 206 Pb atoms. The half-life of decay of 238 U is 4.5 * 10^9 years. Estimate the age of the rock assuming that all the 206 Pb atoms are formed A stable nuclei C is formed from radioactive nuclei A and [...]
Natural uranium is a mixture of three isotopes 92 U 234 , 92 U 235, and 92 U 238 with the shares of negligible 0.0006%, 0.71%, and 99.28%, respectively. The half-life of the three isotopes are 2.5 * 10^5 years,
12
Sep
Natural uranium is a mixture of three isotopes 92 U 234 , 92 U 235, and 92 U 238 with the shares of negligible 0.0006%, 0.71%, and 99.28%, respectively. The half-life of the three isotopes are 2.5 * 10^5 years, 0.71% 92 U 235 and 92 U 238 with the shares of negligible 0.0006% and [...]
If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25cm away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is
12
Sep
If the focal length of objective and eye lens are 1.2 cm and 3 cm respectively and the object is put 1.25cm away from the objective lens and the final image is formed at infinity. The magnifying power of the microscope is A simple telescope The light ray is incidence at angle of 60∘ on [...]