Which of the following is $NOT$ true for electromagnetic waves ?
Which of the following is $NOT$ true for electromagnetic waves ?
- A
they consist of changing electric and magnetic fields
- B
they travel at different speeds in vacuum, depending on their frequency
- C
they transport energy
- D
they transport momentum
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About $5 \%$ of the power of a $100\; W$ light bulb is converted to visible radiation. What is the average intensity of visible radiation
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$(b)$ at a distance of $10\; m ?$ Assume that the radiation is emitted isotropically and neglect reflection.
About $5 \%$ of the power of a $100\; W$ light bulb is converted to visible radiation. What is the average intensity of visible radiation
$(a)$ at a distance of $1 \;m$ from the bulb?
$(b)$ at a distance of $10\; m ?$ Assume that the radiation is emitted isotropically and neglect reflection.
If a source of power $4\ kW$ produces $10^{20}$ photons/second , the radiation belongs to a part of the spectrum called
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- [JEE MAIN 2023]