$^7_ 3 Li + ^1_1 H \rightarrow (^7_3 Li)^* + ^1_1 H$
The question asks about which of the given options represents a photo-disintegration type nuclear reaction. To solve this, let's understand what photo-disintegration is and verify which reaction fits this description.
Photo-disintegration is a nuclear reaction in which a nucleus absorbs a high-energy gamma photon (represented as \(\gamma\)) and becomes excited. The excess energy typically results in the emission of one or more neutrons. It characteristically involves a gamma ray causing the disintegration of a nucleus.
Let's examine each option to determine which one represents photo-disintegration:
- \(^4_2 He + ^{197}_{79} Au \rightarrow ^{197}_{79} Au + ^4_2 He\): This is a scattering process where a helium nucleus interacts with gold but is not a photo-disintegration reaction.
- \(^7_ 3 Li + ^1_1 H \rightarrow (^7_3 Li)^* + ^1_1 H\): This reaction involves Li-7 and a proton, resulting in an excited state of Li-7, but no gamma photon is absorbed or produced, hence not photo-disintegration.
- \(^2_1 H + \gamma \rightarrow ^1_1 H + ^1_0n\): This reaction perfectly matches the definition of a photo-disintegration reaction. A gamma photon is absorbed by deuterium (D or \(^2_1 H\)), causing the emission of a neutron \(^1_0n\). This is a classic example of photo-disintegration.
- \(^{26}_{12} Mg + ^1_1 H \rightarrow (^{27}_{13} Al)^* + \gamma\): This is an example of a nuclear capture reaction where magnesium captures a proton, resulting in an excited aluminum nucleus and emitting a gamma photon. However, it is not a photo-disintegration because the gamma photon is emitted, not absorbed.
Therefore, the correct answer is the third option: \(^2_1 H + \gamma \rightarrow ^1_1 H + ^1_0n\). This reaction clearly demonstrates the concept of photo-disintegration where a gamma photon causes a nucleus to emit a neutron.
Important Questions from Miscellaneous
A stone is thrown horizontally from the top of a 20 m high building with a speed of 12 m/s. It hits the ground at a distance R from the building. Taking g = 10 m/s2 and neglecting air resistance will give :
A sphere of volume V is made of a material with lower density than water. While on Earth, it floats on water with its volume f1V (f1 < 1) submerged. On the other hand, on a spaceship accelerating with acceleration a < g (g is the acceleration due to gravity on Earth) in outer space, its submerged volume in water is f2V. Then:
A railway wagon (open at the top) of mass M1 is moving with speed v1 along a straight track. As a result of rain, after some time it gets partially filled with water so that the mass of the wagon becomes M2 and speed becomes v2. Taking the rain to be falling vertically and the water stationery inside the wagon, the relation between the two speeds v1 and v2 is :
Consider the following statements:
1. Distance between the longitudes becomes zero on North Pole and South Pole.
2. Distance between the longitudes is maximum on the Equator.
3. Number of longitudes is more than number of latitudes.
Which of the statements given above is/are correct?
One block of 2⋅0 kg mass is placed on top of another block of 3⋅0 kg mass. The coefficient of static friction between the two blocks is 0⋅2. The bottom block is pulled with a horizontal force F such that both the blocks move together without slipping. Taking acceleration due to gravity as 10 m/s2, the maximum value of the frictional force is :
