Physics

Class 10

Interactive Science Lab

Electromagnetic Spectrum Simulator

Explore the 7 EM wave regions, continuous frequency and wavelength variations (c = fλ), transverse waves, and E & B fields.

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Electromagnetic Spectrum Simulator

Explore the complete electromagnetic spectrum from long Radio waves to ultra-high-energy Gamma rays. Interact with continuous frequency & wavelength variations, transverse wave oscillations, and orthogonal Electric & Magnetic fields in vacuum.

Class 10 Physics

Unit 12: EM Waves

Visible Light

f = 500.00 THz

λ = 600.0 nm

E = 3.313e-19 J

c = 3 × 10⁸ m/s

Electromagnetic Parameters & Frequency Control

Simulation Concept Mode

Quick Jump to Region (7 Major EM Bands)

Continuous Frequency Control (Logarithmic Scale)

f = 500.00 THz

λ = 600.0 nm

Slider maps logarithmically from 10² Hz (Radio) to 10²² Hz (Gamma Rays).

10² Hz (Radio)10⁸ Hz10¹⁴ Hz (Visible)10¹⁸ Hz10²² Hz (Gamma)

Interactive Formula Calculator (c = f × λ)

Enter any frequency to calculate its corresponding vacuum wavelength using λ = c / f (c = 3 × 10⁸ m/s).

Input Frequency

Calculated Wavelength (λ)

600.0 nm

Step-by-Step Derivation

λ = (3 × 10⁸) / (5.00e+14)

Standard Board Numerical & Benchmark Scenarios

Electromagnetic Parameters & Frequency Control

Simulation Concept Mode

Quick Jump to Region (7 Major EM Bands)

Continuous Frequency Control (Logarithmic Scale)

f = 500.00 THz

λ = 600.0 nm

Slider maps logarithmically from 10² Hz (Radio) to 10²² Hz (Gamma Rays).

10² Hz (Radio)10⁸ Hz10¹⁴ Hz (Visible)10¹⁸ Hz10²² Hz (Gamma)

Interactive Formula Calculator (c = f × λ)

Enter any frequency to calculate its corresponding vacuum wavelength using λ = c / f (c = 3 × 10⁸ m/s).

Input Frequency

Calculated Wavelength (λ)

600.0 nm

Step-by-Step Derivation

λ = (3 × 10⁸) / (5.00e+14)

Standard Board Numerical & Benchmark Scenarios

Live Electromagnetic Measurements & Values

Calculated dynamically from c = f × λ and E = h × f.

Class 10 Physics: Unit 12

EM Region

Visible

Visible Light

Wavelength (λ)

600.0 nm

λ = c / f

Frequency (f)

500.00 THz

f = c / λ

Photon Energy (E)

2.07 eV

3.313e-19 J

Speed in Vacuum

3 × 10⁸ m/s

Constant for all EM waves

Radiation Hazard

Non-ionizing

Standard light-blocking shades, sunglasses with UV/tinted filters.

Fundamental Principles of Electromagnetic Radiation

1. Vacuum Speed Invariance: All electromagnetic waves travel at the exact same constant speed in vacuum (c = 3.0 × 10⁸ m/s).
2. Inverse Relationship: As frequency increases, wavelength decreases proportionally (c = f × λ).
3. Planck-Einstein Energy Relation: Photon energy is directly proportional to frequency (E = h × f). Gamma rays carry trillions of times more energy per photon than radio waves, explaining their ionizing power.

Step-by-Step Physics Formulas & Derivations

Class 10 Physics — Unit 12: Electromagnetic Waves & Radiation (Sindh & Karachi Boards)

Step 1[meters]

Wavelength Calculation

λ = c / f

Sub: λ = (3.0 × 10⁸ m/s) / (5.00e+14 Hz)

Result:λ = 600.0 nm (6.000e-7 m)

Wavelength is inversely proportional to frequency.

Step 2[Joules]

Photon Energy Calculation

E = h × f

Sub: E = (6.626 × 10⁻³⁴ J·s) × (5.00e+14 Hz)

Result:E = 3.313e-19 J (2.07 eV)

Higher frequency radiation carries significantly greater energy per photon.

Step 3[m/s]

Speed in Vacuum Verification

v = f × λ = c

Sub: v = (5.00e+14 Hz) × (6.000e-7 m)

Result:c = 3.0 × 10⁸ m/s (Constant)

All electromagnetic waves propagate at the same constant speed in vacuum.

Step 4

Spectrum Classification & Hazard

Result:Visible Light [Non-ionizing (Low Risk)]

Normal levels are safe; direct exposure to high-power lasers or looking directly at the Sun causes permanent retinal burns.

Complete Electromagnetic Spectrum Comparison Table (Class 10 Syllabus)

Region	Wavelength Range (λ)	Frequency Range (f)	Photon Energy (E)	Speed in Vacuum	Primary Applications	Hazard Level
Radio Waves	10.0 cm – 3000.0 km	100.0 Hz – 3.00 GHz	4.14e-7 eV	3 × 10⁸ m/s	AM/FM radio broadcasting and mobile cellular networks.	Non-ionizing
Microwaves	1.0 mm – 10.0 cm	3.00 GHz – 300.00 GHz	1.01e-5 eV	3 × 10⁸ m/s	Microwave ovens for rapid food cooking, Wi-Fi routers, and Bluetooth devices.	Thermal
Infrared Radiation (Heat Waves)	700.0 nm – 1.0 mm	300.00 GHz – 430.00 THz	1.24e-1 eV	3 × 10⁸ m/s	Television remote controls, home infrared heaters, and night-vision CCTV cameras.	Thermal
Visible Light	380.0 nm – 750.0 nm	430.00 THz – 790.00 THz	2.07 eV	3 × 10⁸ m/s	Human optical vision, photography, room illumination, and plant photosynthesis.	Non-ionizing
Ultraviolet (UV) Rays	10.0 nm – 380.0 nm	790.00 THz – 30.00 PHz	4.14 eV	3 × 10⁸ m/s	Currency banknote counterfeit verification and blacklight glow effects.	Skin
X-Rays (Roentgen Rays)	10.0 pm – 10.0 nm	30.00 PHz – 30.00 EHz	1.24 keV	3 × 10⁸ m/s	Airport baggage security inspection scanners.	Ionizing
Gamma Rays	30.0 fm – 10.0 pm	30.00 EHz – 10000.00 EHz	1.24 MeV	3 × 10⁸ m/s	Industrial sterilization of pre-packaged single-use medical syringes and food preservation (irradiation).	High-Energy

Sound Waves vs Electromagnetic Waves (Class 10 Core Physics Distinction)

Property	Sound Waves (Unit 11)	Electromagnetic Waves (Unit 12)
Wave Nature	Mechanical Wave (vibration of material particles)	Electromagnetic Wave (oscillating E & B fields)
Propagation in Vacuum	CANNOT travel in vacuum (Needs material medium)	CAN travel freely through vacuum
Speed in Vacuum / Air	~340 m/s in air at 20°C (0 m/s in vacuum)	3.0 × 10⁸ m/s (~1,000,000× faster)
Wave Type	Longitudinal (compressions & rarefactions)	Transverse (crests & troughs; E ⟂ B ⟂ v)

Connection to Dispersion of Light (Prism & VIBGYOR)

Visible light represents only a very narrow frequency window (4.3 × 10¹⁴ Hz to 7.9 × 10¹⁴ Hz) of the entire electromagnetic spectrum. The Dispersion of Light experiment explores how composite white light separates into its constituent 7 colors (VIBGYOR) because each individual wavelength experiences a slightly different refractive index (n = c / v) inside a glass prism.

Multi-Wave Comparison Mode (Select up to 4 Regions)

Compare wavelengths, frequencies, and photon energies side-by-side.

Logarithmic Visual Scale

Select Regions to Compare (Active: 3 / 4 max):

Important Scale Disclosure: Comparison uses a logarithmic visual scale — not a physical linear scale. In reality, a radio wavelength (3 meters) is 5,000,000 times larger than visible green light (600 nm) and 3,000,000,000,000 times larger than a gamma ray (1 pm). Linear display would render visible light and gamma waves completely invisible on screen.

Radio Waves

Radio

Waveform (1.5 cycles)c = 3 × 10⁸ m/s

Wavelength (λ):3.00 m

Frequency (f):100.00 MHz

Photon Energy (E):4.14e-7 eV

Speed in Vacuum:3.0 × 10⁸ m/s

Hazard Level:Non-ionizing

Visible Light

Visible

Waveform (8.1 cycles)c = 3 × 10⁸ m/s

Wavelength (λ):600.0 nm

Frequency (f):500.00 THz

Photon Energy (E):2.07 eV

Speed in Vacuum:3.0 × 10⁸ m/s

Hazard Level:Non-ionizing

Gamma Rays

Gamma

Waveform (14.7 cycles)c = 3 × 10⁸ m/s

Wavelength (λ):1.0 pm

Frequency (f):300.00 EHz

Photon Energy (E):1,240,000 eV

Speed in Vacuum:3.0 × 10⁸ m/s

Hazard Level:High-Energy

Real-World Applications, Radiation Safety & Shielding

Class 10 Physics: Everyday technology, diagnostic medicine, and radiation protection.

Radio Waves

3.00 m

The longest wavelength and lowest frequency electromagnetic waves, capable of diffraction around large obstacles.

Daily Life: AM/FM radio broadcasting and mobile cellular networks.

Medicine: Magnetic Resonance Imaging (MRI) body scanning without ionizing radiation.

Science: Radio astronomy telescopes detecting cosmological signals from pulsars and galaxies.

Hazard:Non-ionizing (Low Risk)

Generally non-ionizing and safe at everyday ambient power; extremely high-power radar transmitters can cause dielectric tissue heating.

Shielding: Faraday cage (metallic wire mesh or copper sheeting).

Microwaves

12.2 cm

High-frequency radio waves that penetrate atmospheric haze and cause resonant rotational heating in water and fat molecules.

Daily Life: Microwave ovens for rapid food cooking, Wi-Fi routers, and Bluetooth devices.

Medicine: Diathermy for deep tissue heat therapy in physiotherapy.

Science: Satellite weather telemetry and aircraft navigation radar systems.

Hazard:Thermal Heating Risk

Non-ionizing radiation; high intensity can cause internal thermal burns or cataracts.

Shielding: Metal door grids with perforations much smaller than 12 cm wavelength.

Infrared Radiation (Heat Waves)

10.0 μm

Readily absorbed by water and matter to produce heat sensation; invisible to the naked human eye.

Daily Life: Television remote controls, home infrared heaters, and night-vision CCTV cameras.

Medicine: Thermography for detecting localized inflammation and circulatory issues.

Science: James Webb Space Telescope (JWST) imaging through cosmic dust clouds.

Hazard:Thermal Heating Risk

Intense sources (lasers, industrial furnaces) can cause corneal and skin thermal burns.

Shielding: Gold-coated films, thermal glass, and standard opaque walls.

Visible Light

600.0 nm

The narrow slice of the electromagnetic spectrum detectable by human photoreceptor cells (retina).

Daily Life: Human optical vision, photography, room illumination, and plant photosynthesis.

Medicine: Endoscopy, surgical illumination, and pulse oximetry.

Science: Fiber-optic high-speed global internet cables (total internal reflection).

Hazard:Non-ionizing (Low Risk)

Normal levels are safe; direct exposure to high-power lasers or looking directly at the Sun causes permanent retinal burns.

Shielding: Standard light-blocking shades, sunglasses with UV/tinted filters.

Ultraviolet (UV) Rays

300.0 nm

Higher-energy radiation capable of exciting fluorescent materials and triggering photochemical reactions.

Daily Life: Currency banknote counterfeit verification and blacklight glow effects.

Medicine: Sterilization of surgical instruments, drinking water disinfection, and Vitamin D synthesis.

Science: Forensic analysis of bodily fluids and latent fingerprints at crime scenes.

Hazard:Skin & Eye Risk (UV)

Can cause painful sunburn, premature skin aging, cataract formation, and skin cancer (melanoma).

Shielding: Sunscreen lotion (SPF), UV-blocking polycarbonate glasses, Earth's ozone layer.

X-Rays (Roentgen Rays)

1.0 nm

Ionizing electromagnetic radiation that passes readily through soft biological tissue but is absorbed by dense bone mineral.

Daily Life: Airport baggage security inspection scanners.

Medicine: Diagnostic radiography for bone fractures, dental X-rays, and Computed Tomography (CT scans).

Science: X-ray crystallography for discovering the double-helix structure of DNA and crystal lattices.

Hazard:Ionizing Radiation (Hazardous)

Ionizing radiation that damages cellular DNA; cumulative exposure increases long-term cancer risk.

Shielding: Lead aprons (0.5 mm Pb equivalent), concrete walls, and minimized exposure time.

Gamma Rays

1.0 pm

The most energetic, highest-frequency, and most penetrating radiation in the electromagnetic spectrum.

Daily Life: Industrial sterilization of pre-packaged single-use medical syringes and food preservation (irradiation).

Medicine: Targeted Gamma Knife radiosurgery and radiation therapy for malignant cancerous tumors.

Science: Gamma-ray astronomy observing supermassive black hole relativistic jets.

Hazard:High-Energy Ionizing (Extremely Hazardous)

Extremely penetrating ionizing radiation that causes acute radiation sickness, genetic mutations, and cell death.

Shielding: Thick lead bricks (several centimeters), high-density heavy concrete bunkers.

Class 10 Radiation Safety & Ionizing Hazards Summary

Non-Ionizing Radiation (Radio, Microwave, Infrared, Visible Light): Photon energies are low (E < 3.1 eV), unable to break atomic chemical bonds. High intensity may produce thermal heating.
UV Radiation: Moderately high photon energy (3.1 eV – 124 eV) that triggers chemical reactions, causes sunburn, and damages cellular DNA. Protected by sunscreen and sunglasses.
Ionizing Radiation (X-Rays, Gamma Rays): High photon energy (E > 124 eV, up to millions of eV). Able to knock electrons out of atoms, ionize living cells, and damage DNA. Requires lead aprons (0.5 mm Pb) for X-rays and thick lead bunkers for Gamma rays.

Board Exam Concept Checks

Class 10 Physics: Electromagnetic Waves & Spectrum

Question 1

Class 10 Physics — Unit 12 (Electromagnetic Waves)

Speed of EM Waves in Vacuum

A radio wave (f = 100 MHz) and a gamma ray (f = 10²⁰ Hz) both travel through the vacuum of space. How do their speeds compare?

Question 2

Class 10 Physics — Spectrum Classification

Wavelength and Frequency Relationship

Which region of the electromagnetic spectrum possesses the LONGEST wavelength and LOWEST frequency?

Question 3

Class 10 Physics — Radiation Safety & Applications

Ionizing Radiation and Biological Hazards

Why are X-rays and Gamma rays hazardous to living biological tissue, whereas radio waves and visible light are generally not?

Question 4

Class 10 Physics — Wave Optics & Acoustics Comparison

Sound Waves vs Electromagnetic Waves

What is the fundamental difference between Sound waves and Light (electromagnetic) waves?

Syllabus Mapping & Learning Objectives

This interactive tool is modeled directly after the official Pakistani textbook curriculam (Sindh Textbook Board, Federal Board Islamabad, and Punjab Textbook Board). It provides live parameter tuning so students can test hypotheses, predict exam outcomes, and observe physical/chemical laws mathematically.

Key Topics Covered

Electromagnetic wavesLightRadioMicrowavesInfraredVisibleUVX-raysGamma raysPhoton energy

More Study Resources

Pair this simulation with verified solved board past papers and chapter revision notes.

Solved Board Past Papers Chapter-Wise Revision Guides Online Scientific Calculator