The value of Planck's constant is 6.63 × 10–34 Js. The speed of light is 3 × 1017 nm s–1. Which value is closest to the wavelength in nanometer of a quantum of light with a frequency of 6 × 1015 s–1?
1. 25
2. 50
3. 75
4. 10
Subtopic:  Electromagnetic Radiation |
 86%
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AIPMT - 2013
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A monochromatic infrared range finder of power 1mW emits photons with wavelength 1000 nm in 0.1 second. The number of photons emitted in 0.1 second is-
(Given: h = \(6.626 \times 10^{-34} J~s\) , c = \(3 \times 10^8 m~s^{-1}, \) Avogadro number = \(6.022 \times 10^{23}\))
1. \(30 \times 10^{37}\)
2. \(5 \times 10^{14} \)
3. \(30 \times 10^{34} \)
4. \(5 \times 10^{11} \)

Subtopic:  Electromagnetic Radiation |
 72%
From NCERT
NEET - 2022
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Match the following:

Column I Column II
A. X-rays 1. v=100-104 Hz
B. Ultraviolet wave (UV) 2. v=1010 Hz
C. Long radio waves 3. v=1016 Hz
D. Microwave 4. v=1018 Hz
 
A B C D
1. 4 1 3 2
2. 1 4 2 3
3. 1 4 3 2
4. 4 3 1 2
Subtopic:  Electromagnetic Radiation |
 75%
From NCERT
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