When electromagnetic radiation of wavelength 300 nm

• Course • NCERT • Class 12 • Class 11 • Class 10 • Class 9 • Class 8 • Class 7 • Class 6 • IIT JEE • Exam • JEE MAINS • JEE ADVANCED • X BOARDS • XII BOARDS • NEET • Neet Previous Year (Year Wise) • Physics Previous Year • Chemistry Previous Year • Biology Previous Year • Neet All Sample Papers • Sample Papers Biology • Sample Papers Physics • Sample Papers Chemistry • Download PDF's • Class 12 • Class 11 • Class 10 • Class 9 • Class 8 • Class 7 • Class 6 • Exam Corner • Online Class • Quiz • Ask Doubt on Whatsapp • Search Doubtnut • English Dictionary • Toppers Talk • Blog • Download • Get App Question Updated on: 13/06/2023 When electromagnetic radiaiton of wavelength 300 n m falls on the surface of sodium electrons are emitted with a kinetic enegry of 1.68 × 10 5 J m o l −. What is the minimum enegry needed to remove an electorn from sodium? Strategy: The minimum enegry required to remove an electron from target metal is called work function W 0 of the metal. It can be calculated from Eq., provided we know the energy of the incident photon and kinetic enegry of a single photoelectorn. Step 1 : Calculating the enegry ( E ) of incident photon: E = h v = h c λ = ( 6.6 × 10 − 34 J s ) ( 3.0 × 10 8 m s − 1 ) ( 300 × 10 − 9 m ) = 6.6 × 10 − 19 J Step 2 : Calculating the kinetic enegry of a single photoelecton: K E = ( 1.68 × 10 5 J m o l − 1 ) 6.022 × 10 23 e m o l − 1 0.279 × 10 18 J e − 1 = 2.79 × 10 − 19 J e − 1 Step 3 : Calculating the minimun energy needed to remove an ...

We have to find h ν o ​ h ν o ​ = h ν − K E = λ h . C ​ − 6 . 0 2 3 × 1 0 2 3 1 . 6 8 × 1 0 5 5 / m o l ​ h ν o ​ = 3 0 0 × 1 0 − 9 m 6 . 6 2 6 × 1 0 − 3 4 × 3 × 1 0 8 ​ − 6 . 0 2 3 × 1 0 2 3 1 . 6 8 × 1 0 5 ​ = 0 . 0 6 6 2 6 × 1 0 − 1 7 − 0 . 2 7 8 9 × 1 0 − 1 8 = 0 . 0 6 6 2 6 × 1 0 − 1 7 − 0 . 0 2 7 8 9 × 1 0 − 1 7 h ν o ​ = 0 . 0 3 8 3 7 × 1 0 − 1 7 J The minimum energy necessary to overcome the attractive force between the electron and the surface of the silver metal is 7 . 5 2 × 1 0 − 1 9 J. What will be the maximum kinetic energy of the electrons ejected from silver which is being irradiated with ultraviolet light having a wavelength 3 6 0 A ˚?

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The EM spectrum The EM spectrum Electromagnetic waves are categorized according to their frequency f or, equivalently, according to their wavelength λ = c/f. Visible light has a wavelength range from ~400 nm to ~700 nm. Violet light has a wavelength of ~400 nm, and a frequency of ~7.5*10 14 Hz. Red light has a wavelength of ~700 nm, and a frequency of ~4.3*10 14 Hz. Visible light makes up just a small part of the full electromagnetic spectrum. Electromagnetic waves with shorter wavelengths and higher frequencies include ultraviolet light, X-rays, and gamma rays. Electromagnetic waves with longer wavelengths and lower frequencies include infrared light, microwaves, and radio and television waves. Type of Radiation Frequency Range (Hz) Wavelength Range gamma-rays 10 20 - 10 24 1 mm Problem: Two microwave frequencies are authorized for use in microwave ovens, 900 and 2560 MHz. Calculate the wavelength of each. Solution: • Reasoning: For all electromagnetic waves in free space λf = c. • Details of the calculation: λ = c/f. f = 900*10 6/s,λ = (1/3) m f = 2560*10 6/s,λ = 11.7 cm. Problem: Distances in space are often quoted in units of light years, the distance light travels in one year. (a) How many meters is a light year? (b) How many meters is it to Andromeda, the nearest large galaxy, given that it is 2.54*10 6 light years away? (c) The most distant galaxy yet discovered is 12*10 9 light years away. How far is this in meters? Solution: • Reasoning: All electromagnetic waves...

Discussion introduction A good, general sequence to remember is radio waves, microwaves, infrared, light, ultraviolet, x-rays, gamma rays micropulsations • small, almost sinusoidal fluctuations of the geomagnetic field, usually with durations of seconds to minutes radio waves • oscillating, electric circuits • discovered in 1888 • micropulsations, electric power transmission, analog audio signals, radio transmission, microwaves • ELF, SLF, ULF, VLF, LF, MF, HF, VHF, UHF, SHF, EHF Radio Frequency Bands 1 *The ITU actually assigns the designation ELF to everything below VLF. Thus ELF on the table above is ELF1, SLF is ELF2, and ULF is ELF3. †The middle bands are sometimes identified by their relative wavelengths. Thus low frequency (LF) is also called long wave (LW), medium frequency (MF) is also called medium wave (MW), and high frequency (HF) is also called short wave (SW). ‡This designation is not official, but I like it. The "t" in tremendous matches the "t" in terahertz (the geometric mean of the band), matches the "t" in twelve (1THz=10 12Hz), matches the "t" in trillion (10 12 is also known as a trillion). name ITU 1 number frequency wavelength extremelylowfrequency (ELF)* 1 (~10 01Hz) 3 - 30Hz 100,000 - 10,000km superlowfrequency (SLF)* 2 (~10 02Hz) 30 - 300Hz 10,000 - 1,000km ultralowfrequency (ULF)* 3 (~10 03Hz) 300 - 3000Hz 1000 - 100km verylowfrequency (VLF) 4 (~10 04Hz) 3 - 30kHz 100 - 10km lowfrequency (LF) † 5 (~10 05Hz) 30 - 300kHz 10 - 1km mediumfrequency (M...

[ "article:topic", "emissivity", "radar", "radio waves", "thermal agitation", "visible light", "Gamma decay", "gamma (\u03b3) rays", "FM", "ionizing radiation", "ozone", "AM Radio Waves", "tetrahertz radiation", "thermography", "thermal radiation", "spectral color", "optical window", "non-ionizing radiation", "X-ray spectroscopy", "X-ray crystallography", "radiograph", "showtoc:no", "source@https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-013-electromagnetics-and-applications-spring-2009" ] \( \newcommand\) • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Radio Waves Radio waves are a type of electromagnetic (EM) radiation with wavelengths in the electromagnetic spectrum longer than infrared light. They have have frequencies from 300 GHz to as low as 3 kHz, and corresponding wavelengths from 1 millimeter to 100 kilometers. Like all other electromagnetic waves, radio waves travel at the speed of light. Naturally occurring radio waves are made by lightning or by astronomical objects. Artificially generated radio waves are used for fixed and mobile radio communication, broadcasting, radar and other navigation systems, communications satellites, computer networks and innumerable other applications. Different frequencies of radio waves have different propagation characteristics in the Earth’s atmosphere—long waves may cover a part of the Earth very consistently, shorter waves can reflect off the ionosphere and travel around the worl...

1 Science and the Universe: A Brief Tour • Introduction • 1.1 The Nature of Astronomy • 1.2 The Nature of Science • 1.3 The Laws of Nature • 1.4 Numbers in Astronomy • 1.5 Consequences of Light Travel Time • 1.6 A Tour of the Universe • 1.7 The Universe on the Large Scale • 1.8 The Universe of the Very Small • 1.9 A Conclusion and a Beginning • For Further Exploration • 3 Orbits and Gravity • Thinking Ahead • 3.1 The Laws of Planetary Motion • 3.2 Newton’s Great Synthesis • 3.3 Newton’s Universal Law of Gravitation • 3.4 Orbits in the Solar System • 3.5 Motions of Satellites and Spacecraft • 3.6 Gravity with More Than Two Bodies • Key Terms • Summary • For Further Exploration • Collaborative Group Activities • 4 Earth, Moon, and Sky • Thinking Ahead • 4.1 Earth and Sky • 4.2 The Seasons • 4.3 Keeping Time • 4.4 The Calendar • 4.5 Phases and Motions of the Moon • 4.6 Ocean Tides and the Moon • 4.7 Eclipses of the Sun and Moon • Key Terms • Summary • For Further Exploration • Collaborative Group Activities • 5 Radiation and Spectra • Thinking Ahead • 5.1 The Behavior of Light • 5.2 The Electromagnetic Spectrum • 5.3 Spectroscopy in Astronomy • 5.4 The Structure of the Atom • 5.5 Formation of Spectral Lines • 5.6 The Doppler Effect • Key Terms • Summary • For Further Exploration • Collaborative Group Activities • 6 Astronomical Instruments • Thinking Ahead • 6.1 Telescopes • 6.2 Telescopes Today • 6.3 Visible-Light Detectors and Instruments • 6.4 Radio Telescopes • 6.5 Observ...