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Q. No.What is the wavelength of light that has a frequency of \(4.00\times10^{14}~\text{s}^{-1}\)?
(Given: The speed of light is \(3.00\times10^8~\text{m s}^{-1}\))
(Given: The speed of light is \(3.00\times10^8~\text{m s}^{-1}\))
| 1. | \(7.5~\text{nm}\) | 2. | \( 133~\text{nm}\) |
| 3. | \( 750~\text{nm}\) | 4. | \(1.33~\text{cm}^{-1}\) |
Subtopic: Electromagnetic Radiation |
80%
Level 1: 80%+
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Two radiations have wavelengths \(8000\) Å and \(16000\) Å, with corresponding energies \(E_1\) and \(E_2\), respectively. Establish the relationship between \(E_1\) and \(E_2\).
1. \(E_1=6E_2\)
2. \(E_1=2E_2\)
3. \(E_1=4E_2\)
4. \(E_1=1 / 2 E_2\)
Subtopic: Electromagnetic Radiation |
86%
Level 1: 80%+
Hints
A yellow lamp of power 100 W (J s–1) emits radiation of wavelength 560 nm. Calculate the total number of photons emitted by the lamp in 1.0 s:
| 1. | 1.6 × 1018 | 2. | 1.4 × 1018 |
| 3. | 2.8 × 1020 | 4. | 2.1 × 1020 |
Subtopic: Electromagnetic Radiation |
84%
Level 1: 80%+
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Q. No.
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