Answer:
Minimum required frequency is υmin = 654.9 x 10¹² Hz
Explanation:
The energy of a photon is given by the equation:
E = hυ
where,
E = energy of photon
h = Plank's Constant = 6.626 x 10⁻³⁴ J.s
υ = frequency
The minimum energy of photon, must be equal to the work function of Calcium.
Emin = ∅₀ = h(υmin)
υmin = ∅₀/h
where,
υmin = minimum frequency
∅₀ = work function = 4.34 x 10⁻¹⁹ J
Therefore,
υmin = 4.34 x 10⁻¹⁹ J/6.625 x 10⁻³⁴ J.s
<u>υmin = 654.9 x 10¹² Hz</u>
Answer:
skates
Explanation:
Ice hockey is considered to be an extremely tough sport in which there are twelve players who fights over small 3" puck which can be launched like a missile. If one plays ice hockey he should must have necessary equipment to support his sport. These equipment include Ice Skates,Helmet with Cage and Mouth-guard:, Hockey stick, Hockey pants,Hockey gloves, shoulder pads, elbow pads, Shin Guard:Neck guard and Jockstrap (men) or Pelvic protector (women).
<em>Here we can see that correct choice is ice skate which is important for supporting player's ankles while playing ice hockey.</em>
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Hope it helps!
Answer:
A mercury barometer is a device use to measure stomspheric pressure and is constructed as following:
- A mercury barometer requires a tube which has one close end, and one open end.
- Tube is placed upside down in a beaker in such a way so that one end open in the beaker and the other remain outside of the beaker.
- The barometric liquid (mercury) is then filled in the tube by pouring mercury liquid in the beaker.
The position of tube creates vacuum between the closed end of the tube and liquid surface and the Mercury has high density that is why used as the liquid to measure pressure.
Explanation:
The rate of consumption of electric energy in an electric appliance is called electric power. Hence, the rate at which energy is delivered by a current is the power of the appliance.
Although a zig zag pattern going up a mountain means you walk further, the incline of the slope is a lot less so you don't have to work as hard.
