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 nanometers of a quantum of light with a frequency of 6 × 1015 s–1?

1. 25
2. 50
3. 75
4. 10
Subtopic:  Electromagnetic Radiation |
 87%
From NCERT
AIPMT - 2013
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A monochromatic infrared range finder of power 1milli watt 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 types of wave in column I with the corresponding frequency in column II
and mark the appropriate option:

Column I
(Types of Wave)
Column II
(Corresponding Frequency)
A. X-rays I.  v=100-104 Hz
B. Ultraviolet wave (UV) II.  v=1010 Hz
C. Long radio waves III.  v=1016 Hz
D. Microwave IV.  v=1018 Hz
   
A B C D
1. IV I III II
2. I IV II III
3. I IV III II
4. IV III I II
Subtopic:  Electromagnetic Radiation |
 76%
From NCERT
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