Which of the following has the shortest wavelength? MCQ with Answer and Explanation

Which of the following has the shortest wavelength?
A. X-rays
B. Infrared
C. Gamma rays
D. Ultraviolet
Answer: Option C
Solution (By JKExamLibrary)
Gamma rays have wavelengths < 10⁻¹² m, shortest in EM spectrum. X-rays 10⁻¹⁰-10⁻⁸ m. UV 10⁻⁸-4×10⁻⁷ m. IR longer. So gamma rays shortest. Highest frequency, energy.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error
A wire of resistivity ρ, length L, area A has resistance R. If length doubled and area halved, new resistance is
A. 2R
B. R
C. 4R
D. R/2

Correct Answer: Option C


Explanation:
R = ρL/A. New R' = ρ(2L)/(A/2) = 4ρL/A = 4R.

This question belongs to: Science Physics
Question #2 Report Error
The splitting of white light into its constituent colors by a prism is due to
A. Total internal reflection
B. Dispersion
C. Reflection
D. Scattering

Correct Answer: Option B


Explanation:
Dispersion: different wavelengths refract at different angles because refractive index varies with wavelength.

This question belongs to: Science Physics
Question #3 Report Error
The potential at a point due to a point charge is 10 V at distance 2 m. Potential at 4 m is
A. 10 V
B. 20 V
C. 5 V
D. 2.5 V

Correct Answer: Option C


Explanation:
V ∝ 1/r. So if r doubled, V halved = 5 V.

This question belongs to: Science Physics