Explanation:
We know
the frequency of the tube with one end open and the other end closed follows the given relations as
: 
: 
: 
= 1 : 3 : 5 : 7
∴ the 4th allowed wave is = 7
= 
We know = 1975 Hz and v = 343 m/s ( as given in question )
∴
= 0.303 m
We know that v = x 
= 0.17 m
Now when the warmer air is flowing, the speed gets doubled and the mean temperature increases. And as a result the wavelength increases but the amplitude and the frequency remains the same.
So we can write
v ∝ λ
or 
Therefore, the wavelength becomes doubled = 0.17 x 2
= 0.34 m
Now the new length of the air column becomes doubled
∴ 
= 0.3 x 2
= 0.6 m
∴ New speed, 
= 2 x 343
= 686 m/s
∴ New frequency is 
= 283 Hz
∴ The new frequency remains the same.
Now we know
= 12 m/s, 
= 4 m/s, 
= 1975 Hz
Therefore, apparent frequency is 
= 2020.5 Hz
Time = (distance) / (speed)
Time = (0.25 km) / (65 km/hr)
<em>Time = 0.00385 hour</em>
(That's 13.85 seconds.)
<u />
<u>Better way:</u>
Distance = 0.25 km
Distance = 250 meters
Speed = (65 km/hr) x (1000 m/km) x (1 hr/3600 sec)
Speed = 18.06 m/sec
Time = (250 m) / (18.06 m/s)
<em>Time = 13.85 seconds </em>
Answer:
Mental time travel has been studied by psychologists, cognitive neuroscientists, philosophers and in a variety of other academic disciplines. Major areas of interest include the nature of the relationship between memory and foresight, the evolution of the ability (including whether it is uniquely human or shared with other animals), its development in young children, its underlying brain mechanisms, as well as its potential links to consciousness, the self, and free will.
Explanation:
Answer:
option (a)
Explanation:
Wavelength is defined as the distance traveled by the wave in one complete oscillation.
The number of oscillations completed in one second is called frequency.
The relation for the wave velocity is given by
wave velocity = frequency x wavelength
