physics Flashcards
when a body moves in a circle, the angle b/w its linear velocity 𝑣 and angular velocity ω is
90°
the efficiency of carnot engine depends upon
both source and sink temperature
distance b/w two consecutive nodes
λ / 2
i.(j x k) =
1
one geostationary satellite covers a longitude of
120°
the frequency of second’s pendulum is
0.5 Hz
what particle has greatest speed
gamma particles
for a body thrown vertically upwards, the time to reach maximum height is given by the formula:
t = u/g
(t=time, u=initial velocity, g=9.8)
min speed required to leave earth
40,000 km/hr
what method of heat transfer can take place in a vacuum
radiation
what electromagnetic radiation transmits the highest photon energy
gamma rays
greenhouse gases absorb ________ radiation
infrared
if we add all colours of the rainbow what is the resultant colour
white
when white light passes through a prism it splits into how many colours
7
what lens does a camera use to form an image on a piece of film at the back
convex lens
short sighted defect could be corrected by a
concave lens
in humans, heart functions as a source of
electromotive force
ozone layer protects the earth from
ultraviolet radiations from the sun
what is the distance b/w moon and earth
384,000 km
how many planets orbit the sun
8
what keeps planets in orbit
gravitational pull of the sun
examples of renewable energy
- geothermal energy
- solar energy
- bio fuels
name the process where vapors of a substance are cooled and turned into liquid
condensation
instrument used to measure gas pressure
manometer
adding salt to pure water ___________ its boiling point
increases
boiling point of alcohol
79°C
presence of impurities ___________ the freezing point of water
decreases
