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  1. Problems
  2. /Waves & Sound
  3. /Electromagnetic Waves

Electromagnetic Waves

Physics
+ Upload a Problem
More in Waves & SoundOscillations and Simple Harmonic MotionWave MotionSound Waves and HearingSuperposition and Standing WavesDoppler EffectElectromagnetic Waves
30 problems
Exam:
Type:
1.
The electric field of a plane wave in vacuum is Ex = 120 sin(kz - ω t) in V/m… New
High School (11–12) · Electromagnetic WavesNEETBoard ExamAP+22APA-LevelIBStemPy LabStemPy Lab
Medium
2.
The plates of a capacitor are discs of radius 8.0 cm, with a vacuum between them… New
High School (11–12) · Electromagnetic WavesNEETBoard ExamAP+22APA-LevelIBStemPy LabStemPy Lab
Medium
3.
A laser sends out a pulse of 40 mJ that lasts 8.0 ns… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+1APA-LevelIBStemPy LabStemPy Lab
Easy
4.
A spherical dust grain of radius 0.50 µm and density 1000 kg/m³ is at the Earth's distance from the… New
High School (11–12) · Electromagnetic WavesJEE MainJEE AdvancedNEET+28OlympiadAPA-Level+1StemPy LabStemPy Lab
Hard
5.
A laser beam of power 5.0 W meets a flat surface at an angle of incidence of 35°, measured from the… New
High School (11–12) · Electromagnetic WavesJEE MainJEE AdvancedNEET+28OlympiadAPA-Level+1StemPy LabStemPy Lab
Hard
6.
A sail has an area of 4000 m² and a total mass of 18 kg… New
High School (11–12) · Electromagnetic WavesNEETBoard ExamAP+22APA-LevelIBStemPy LabStemPy Lab
Medium
7.
Sunlight near the Earth has an intensity of 1361 W/m²… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+1APA-LevelIBStemPy LabStemPy Lab
Easy
8.
A helium-neon laser sends out a beam of power 3.0 mW… New
High School (11–12) · Electromagnetic WavesJEE MainJEE AdvancedNEET+28OlympiadAPA-Level+1StemPy LabStemPy Lab
Hard
9.
A radio transmitter radiates 25 kW equally in all directions… New
High School (11–12) · Electromagnetic WavesNEETBoard ExamAP+22APA-LevelIBStemPy LabStemPy Lab
Medium
10.
A plane wave in vacuum has a peak electric field of 450 V/m… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+1APA-LevelIBStemPy LabStemPy Lab
Easy
11.
A television tower is 180 m tall. A receiving antenna stands 20 m above the ground… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+21APA-LevelIBStemPy LabStemPy Lab
Medium
12.
Sunlight at Mars has a power of 586 W for each square metre, and Mars reflects 25 % of it… New
High School (11–12) · Electromagnetic WavesJEE MainJEE AdvancedBoard Exam+27OlympiadAPA-Level+1StemPy LabStemPy Lab
Hard
13.
A layer of the ionosphere has 2.5 × 10¹¹ free electrons in each cubic metre… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+21APA-LevelIBStemPy LabStemPy Lab
Medium
14.
A photon of sunburn light has a wavelength of 300 nm… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+1APA-LevelIBStemPy LabStemPy Lab
Easy
15.
A microwave oven works at 2.45 GHz. A cup holds 0.250 kg of water at 20 °C… New
High School (11–12) · Electromagnetic WavesJEE MainJEE AdvancedBoard Exam+27OlympiadAPA-Level+1StemPy LabStemPy Lab
Hard
16.
An X-ray tube works at 60 kV. Use hc = 1240 eV nm and h = 4.14 × 10⁻¹⁵ eV s… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+21APA-LevelIBStemPy LabStemPy Lab
Medium
17.
The skin of a person is at about 310 K. Use Wien's constant b = 2.898 × 10⁻³ m K and hc = 1240 eV… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+1APA-LevelIBStemPy LabStemPy Lab
Easy
18.
Four sources each send out electromagnetic waves with a power of 5.0 W: a radio transmitter at 100… New
High School (11–12) · Electromagnetic WavesJEE MainJEE AdvancedBoard Exam+27OlympiadAPA-Level+1StemPy LabStemPy Lab
Hard
19.
Use c = 3.00 × 10⁸ m/s, hc = 1240 eV nm and h = 4.14 × 10⁻¹⁵ eV s… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+21APA-LevelIBStemPy LabStemPy Lab
Medium
20.
An FM radio station broadcasts at a frequency of 94.3 MHz… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+1APA-LevelIBStemPy LabStemPy Lab
Easy
21.
In a repeat of Hertz's experiment, a metal sheet reflects a wave and makes standing waves… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+21APA-LevelIBStemPy LabStemPy Lab
Medium
22.
In a non-magnetic dielectric a plane wave of frequency 80 MHz has a peak electric field of 24 V/m… New
High School (11–12) · Electromagnetic WavesJEE MainJEE AdvancedBoard Exam+27OlympiadAPA-Level+1StemPy LabStemPy Lab
Hard
23.
The electric field of a plane wave in vacuum, in V/m, is Ey = 42 sin(1.05x + 3.15 × 10⁸t) with x in… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+21APA-LevelIBStemPy LabStemPy Lab
Medium
24.
A plane radio wave in air has a peak electric field of 15 V/m and a wavelength of 2.5 m… New
High School (11–12) · Electromagnetic WavesBoard ExamAPA-Level+1APA-LevelIBStemPy LabStemPy Lab
Easy
25.
In a round region of radius 20 cm the electric field is uniform and changes as E = E₀sinω t, with… New
High School (11–12) · Electromagnetic WavesJEE MainJEE AdvancedBoard Exam+27OlympiadAPA-Level+1StemPy LabStemPy Lab
Hard
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