The electromagnetic waves with highest frequency are MCQ with Answer and Explanation

The electromagnetic waves with highest frequency are
A. X-rays
B. Gamma rays
C. Ultraviolet
D. Radio waves
Answer: Option B
Solution (By JKSSB Mock Tests)
Gamma rays >10¹⁹ Hz, highest.

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Practice More Physics Questions

Question #1
According to Newton's Law of Cooling, the rate of loss of heat from a body is strictly proportional to:
A. The absolute temperature of the surroundings.
B. The square of the temperature of the body.
C. The temperature difference between the body and its surroundings.
D. The fourth power of the temperature difference.

Correct Answer: Option C


Explanation:
Newton's Law of Cooling is a practical approximation stating that the rate of heat loss of a body is directly proportional to the difference in temperatures between the body and its immediate environment, provided this temperature difference is relatively small. The equation is dQ/dt = -k(T_body - T_surroundings).

This question belongs to: Science Physics
Question #2
If the error in the measurement of the momentum of a particle is +100%, what will be the percentage error in the measurement of its kinetic energy?
A. 400%
B. 300%
C. 200%
D. 100%

Correct Answer: Option B


Explanation:
Kinetic Energy (K) is given by K = p^2 / 2m. If momentum (p) increases by 100%, the new momentum is p' = p + 1.0p = 2p. The new kinetic energy is K' = (2p)^2 / 2m = 4(p^2 / 2m) = 4K. The increase is 4K - K = 3K. Percentage increase = (3K/K) * 100 = 300%.

This question belongs to: Science Physics
Question #3
The kinetic energy of a body is 100 J and momentum 50 kg m/s. Mass is
A. 12.5 kg
B. 25 kg
C. 4 kg
D. 2 kg

Correct Answer: Option A


Explanation:
K = p²/(2m) => 100 = 2500/(2m) => m = 2500/200 = 12.5 kg.

This question belongs to: Science Physics