Answer:
A higher amplitude means a higher frequency which means a higher energy the higher the wavelength means lower energy because its not as precise and cant reach levels small wavelengths can the sound waves that usually damage our ears are small wavelengths because of the energy applied to them
Explanation:
To find the internal energy of gas we can use
here given that
Number of moles (n) = 7 moles
Temperature T = 40 + 273 = 313 K
degree of freedom(f) = 5 (for diatomic gas)
now by above formula
<em>So it is approximately 45500 J (option C)</em>
Answer:
Explanation:
L 1: front radius 950 mm, rear radius 2700 mm, refractive index 1.528;
We shall use lens maker's formula , that is
1/f = (μ-1) ( 1/R₁ - 1/R₂) , μ is refractive index of the lens , R₁ and R₂ are radius of curvature of front and rear curved surface.
1/f₁ = (1.528-1)( 1/950 + 1/2700)
f₁ = 1331 mm
L2: front radius 535 mm, rear radius 500 mm, refractive index 1.550.
1/f₂ = (1.550-1)( 1/535 + 1/500)
f₂ = 470 mm
largest angular magnification possible
= f₁ /f₂
= 1331 / 470
= 2.83 ( approx )
Length between two lenses
=1331 +470
= 1801 mm
= 1.8 m Ans
Answer:
Explanation:
Initial velocity in air, Vo = 0 m/s
Final velocity in air, Vi = 16 m/s
Initial velocity in water, Vf = 3 m/s
Total distance, S = 127 m
Total time, T = 12 s
Using the equation of motion,
(V - U)t = s
S = s1 + s2
Let T = t1 + t2
127 = (16 × t1) + 3 × (12 - t1)
127 = 16t1 + 36 - 3t1
91 = 13t1
t1 = 91/13
= 7 seconds
Time taken in air, t1 = 7 seconds
t2 = 12 - 7
= 5 seconds.
Answer: B. Sensation
Explanation:
Sensation is input about the physical world obtained by our sensory receptors, and perception is the process by which the brain selects, organizes, and interprets these sensations. In other words, senses are the physiological basis of perception. Perception of the same senses may vary from one person to another because each person’s brain interprets stimuli differently based on that individual’s learning, memory, emotions, and expectations.
The sensitivity of a given sensory system to the relevant stimuli can be expressed as an absolute threshold. Absolute threshold refers to the minimum amount of stimulus energy that must be present for the stimulus to be detected 50% of the time.
Sometimes, we are more interested in how much difference in stimuli is required to detect a difference between them. This is known as the just noticeable difference (jnd) or difference threshold.