Radioactivity

If the half-life of a radioactive element is one year, the percentage of sample decay after two years is

 
 
 
 

Beta (β) particles are fast-moving

 
 
 
 

Gamma rays from cobalt-60 are used for the treatment of

 
 
 
 

When β-rays are emitted, the nuclear mass

 
 
 
 

Which particle has a large range in air?

 
 
 
 

One of the isotopes of uranium is U-239 with atomic number 92. Its nucleon number is

 
 
 
 

Which of the following will be absorbed by paper?

 
 
 
 

In the reaction, X + ¹⁰n → ¹⁴⁷N + ⁴²He, X is

 
 
 
 

The ionization power of an α-particle is

 
 
 
 

Question 1 of 9

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  4. Give an example of vibratory motion which is not simple harmonic motion. Give a reason for your selection.
  5. At the extreme position, velocity is zero but acceleration is maximum in simple harmonic motion. How can you theoretically explain it?
  6. What will happen to the acceleration of a mass-spring system if its mass is doubled?
  7. A simple pendulum has a time period “T”. What will happen to its time period if its thread length is shortened to half?
  8. A simple pendulum has a time period of 4 seconds. Will its time period remain the same or change if its steel bob is replaced by a wooden bob of the same size?
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  10. A simple pendulum has a time period “T” in Murree. In Karachi, it has a different time period. What would you do to make its time period the same as it was in Murree?
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  12. Why do water waves refract at the boundary of shallow water and deep water in a ripple tank experiment?
  13. Under what conditions are waves diffracted the most?
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