An important spectral emission line has a wavelength of $21 cm$. The corresponding photon energy is
$(h = 6.62 \times {10^{ - 34}}Js;\;\;c = 3 \times {10^8}m/s)$
An important spectral emission line has a wavelength of $21 cm$. The corresponding photon energy is
$(h = 6.62 \times {10^{ - 34}}Js;\;\;c = 3 \times {10^8}m/s)$
- A
$5.9 \times {10^{ - 4}}eV$
- B
$5.9 \times {10^{ - 6}}eV$
- C
$5.9 \times {10^{ - 8}}eV$
- D
$11.8 \times {10^{ - 6}}eV$
Similar Questions
A photo sensitive material is at $9\,m$ to the left of the origin and the source of light is at $7\,m $ to the right of the origin along $x$ -axis. The photosensitive material and the source of light start from rest and move, respectively, with $8 \widehat i \, m / s$ and $4 \widehat i \, m / s$ . The ratio of intensities at $t = 0$ to $t = 3\,s$ as received by the photosensitive material is :-
A photo sensitive material is at $9\,m$ to the left of the origin and the source of light is at $7\,m $ to the right of the origin along $x$ -axis. The photosensitive material and the source of light start from rest and move, respectively, with $8 \widehat i \, m / s$ and $4 \widehat i \, m / s$ . The ratio of intensities at $t = 0$ to $t = 3\,s$ as received by the photosensitive material is :-
Assertion : Mass of moving photon varies inversely as the wavelength.
Reason : Energy of the particle $= mass\times(speed \,of \,light)^2$
Assertion : Mass of moving photon varies inversely as the wavelength.
Reason : Energy of the particle $= mass\times(speed \,of \,light)^2$
- [AIIMS 2000]
Frequency of photon having energy $66 eV$ is
Frequency of photon having energy $66 eV$ is
Dual nature of radiation is shown by
Dual nature of radiation is shown by
If $5\%$ of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per sec by a $100$ $watt$ lamp ? Assume wavelength of visible light as $5.6\times10^{-5}\, cm$.
If $5\%$ of the energy supplied to a bulb is irradiated as visible light, how many quanta are emitted per sec by a $100$ $watt$ lamp ? Assume wavelength of visible light as $5.6\times10^{-5}\, cm$.