Sounds Waves And Motion - Study Mode

[#86] In which medium does sound travel at maximum speed?
Correct Answer

(A) Solid

[#87] What is the relation between frequency and time period-
Correct Answer

(D) $$T = frac{1}{f}$$

[#88] In which of the following mediums does the sound travel fastest at a particular temperature?
Correct Answer

(D) Iron

[#89] Assertion (A): A jet aircraft moving at mach number equal to 1 travels faster at an altitude of 15 km than while moving at mach number equal to 1 near the sea level. Reason (R): The velocity of sound depends on the temperature of the surrounding medium.
Correct Answer

(D) (A) is false, but (R) is true

[#90] Match List I (Electromagnetic radiation) with List II (Approximate wavelength in metre) and select the correct answer: List-I List-II a. Infrared radiation 1. 10 -12 b. X-rays 2. 10 -5 c. Ultraviolet radiation 3. 10 -10 d. Gamma rays 4. 10 -8
Correct Answer

(A) a-2, b-3, c-4, d-1