Question
The half-life of a radioactive substance is 5 hours. How much of the substance remains after 15 hours?
More Physics GS Questions
- In an atom, which particles are responsible for chemical bonding?
- A pond of water appears less deep due to –
- Which law states that the current through a conductor is directly proportional to the voltage across it?
- A dipole placed in uniform electric field experiences:
- A soap bubble shows colours when illuminated with white light. This is due to –
- A silicon sample is doped such that the number of holes far exceeds the number of electrons. Which of the following is true about its conductivity?
- If a lens forms an image of magnification -2, what is the nature of the image?
- Sound travels fastest in which medium?
- A plane mirror is placed on a wall. A man walks directly toward the mirror at 2 m/s. The speed at which his image approaches him is:
- The colour of sky appears blue due to –
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