"Über das
farbige Licht der Doppelsterne und einiger anderer Gestirne des Himmels” .. ..
.. can you decipher what this is about ??
On the coloured light of the
binary stars and some other stars of the heavens - a treatise by Doppler (1842) in which he
postulated his principle that the observed frequency changes if either the
source or the observer is moving, which later was termed the Doppler effect.
At MV Diabetics – every
time, I go for full check-up, besides blood tests, there are checks on retina,
leg, kidney and more .. .. one of them is Doppler test ! - Doppler ultrasound
is a noninvasive test used to estimate
the blood flow through the blood vessels
by bouncing high-frequency sound waves (ultrasound) off circulating red blood
cells. A Doppler ultrasound may help diagnose many conditions, including: blood
clots, poor functioning of valves in leg veins, heart valve defects, blocked
artery, decreased blood circulation in legs, bulging arteries and more.
IPL is drawing
to a close and what a engrossing match it was between Lucknow Super Giants and
Royal Challengers Bangalore. RCB had a big surge with a partnersnip of 92 off a
mere 41 balls – but it could well have
been 0
off 2 balls! – LSG was without luck !
It was - 13.3 – Ravi Bishnoi
was bowling a good spell, Dinesh Karthik who had just come, was sort of
struggling to read him. A wrong’un
turning so much, left DK bamboozled – while everyone thought it was clear LBW,
Umpire had different view ! - Hardik
Pandya reviewed, it was marginally
pitching outside (Umpire’s call) but clipped leg – had it been given out by
Umpire earlier, he would have stayed with the decision but Karthik getting a
reprieve went on to score more !
Balls later 18.1 – Chameera
to DK- it was reverse. The ball struck the pads, DK was given out and he went
to review. He had shuffled across
expecting a wide yorker – Chameera bowled straight and hit the boot on the
full. But this time, Ultra edge scored
scratches though to the naked eye, there appeared some gap between bat and
pad.
LSG had an organized chase
but close to finish line came back Harshal Patel who had given just 8 off 2 –
started off badly with two wides, one of which went for four too, beating
DK. But came back strongly with mix of
short and slower ones, frustrating Stoinis, who hit correctly and powerfully
but straight to deep throat – Patidar standing there. The man can do nothing wrong, destined to
perform. Rajat Patidar, a Royal Challengers regular was
left out this year, went unsold but came in mid-season as cover for an injury
to Luvnith Sisodia – today he scored a sensational unbeaten 112 off 54 to
propel the team into the second Qualifier. He had his share of luck too - dropped in the 16th over, he scored 40 off 14
balls.
Amid all the carnage, Super
Giants' Mohsin Khan and Royal Challengers' Harshal Patel returned identical and
remarkable figures of 4-0-25-1. IPL
stirs controversies every now and then – this time it was technology. Ultra-Edge have picked edges that didn't exist
and vice-versa while on one instance. It
was shambolic when CSK played MI when there was no DRS available due to a power
failure. Then came this bloomer – when in the Qualifier between Gujarat Titans
and Rajasthan Royals, speedometer showed R Ashwin bowling a delivery at 131.6
kph. It was the eight over of the Titans innings, Ashwin bowled a ball at
his normal speed, which must have been around the 85-95 kph-mark. But
surprisingly, the speedometer showed the ball to be bowled at over 130 kph,
which Matthew Wade glided away for a single. Sure enough, users on Twitter were
quick to spot the glaring error and expressed their opinions on the gaffe. This
wasn't the first time at the speedometer messed up. During the match between
Delhi Capitals and Mumbai Indians, the piece of technology reported a delivery
from Kuldeep Yadav to be at 116 kph. Kuldeep has often varied his pace and
added speed to his deliveries, but the maximum he has stretched it is in the
early 100s.
Measuring the velocity of
the ball through Radar Guns or Speed Guns is like measuring the speed of the
moving car. This technique was discovered in 1947 by "John
Baker". Speed gun works on the
principle of Doppler Effect. This Speed Gun has a receiver and a transmitter. The
Speed Gun is placed on a high pillar near the Sight screen, from which Speed
Gun sends radio wave in the direction of the pitch and calculates the speed of
any object on the pitch. The gun
basically captures the speed by measuring the speed of the ball without
error. As the ball passes the radar gun,
the speed is recorded and speed details are flashed on screen, not only in
Cricket but also in Tennis.
Technology at best is
technology and can be interpreted differently.
There are some different correlations on how the delivery could be
faster than it is. Batsman are brought
up on a diet of right-arm-over bowling that is released from high-on the same
area, ball after ball after ball. Remove that familiarity, and the feeling of
speed goes up. In the Caribbean in 2019, TV showed Jasprit Bumrah's release
point was half a metre closer to the batter than Kemar Roach's. This gave
Bumrah the effect of bowling 3.7mph faster than the speed gun was showing. To read it differently, if every other bowler
bowls from 22 yards, Bumrah release makes it only 21.5.
Christian Andreas Doppler (1803-
1853) was an Austrian mathematician and
physicist. He is celebrated for his principle – known as the Doppler effect –
that the observed frequency of a wave depends on the relative speed of the
source and the observer. He used this concept to explain the colour of binary
stars. At the age of 38, Doppler gave a lecture to the Royal Bohemian Society
of Sciences and subsequently published his most notable work, Über das farbige
Licht der Doppelsterne und einiger anderer Gestirne des Himmels ("On the
coloured light of the binary stars and some other stars of the heavens"). The Doppler effect is the change in frequency
of a wave in relation to an observer who is moving relative to the wave source. A common example of Doppler shift is the
change of pitch heard when a vehicle sounding a horn approaches and recedes
from an observer. Compared to the emitted frequency, the received frequency is
higher during the approach, identical at the instant of passing by, and lower
during the recession.
Interesting ! – confusing !!
26th May 2022.
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