The shortest wavelength is on the (high energy)left side of this diagram with Gamma rays. The longest wavelength waves are radio, around 3 meters. So, as you progress, the wavelengths get A) <u><em>longer.
</em></u>
Answer: 50m/s
Explanation: if you add 10 x 1 is 10 so you leave it as 10 then you do 10 x 5 which will come out as 50 so then you get the answer 50m/s
1) The half-life is the time required for a substance to reduce to half its initial value. In formulas:
(1)
where
m(t) is the amount of substance left at time t
m0 is the initial mass
is the half-life
In this problem, the half-life of the substance is 20 years:
therefore, the fraction of sample left after t=40 years will be
So, only 1/4 of the original sample will be left, which corresponds to 25%.
2) We can use again formula (1), by re-arranging it:
If we use m(t)=10 g (mass of uranium left at time t), and
(the time is equal to 4 half lifes), we get
So, the initial sample of uranium was 160 g.
Answer:
23.63 °C
Explanation:
= mass of water = 0.250 kg
= initial temperature of water = 20.0 °C
= Specific heat of water = 4186 J/(kg °C)
= mass of aluminum = 0.400 kg
= initial temperature of aluminum = 26.0 °C
= Specific heat of aluminum = 900 J/(kg °C)
= mass of copper = 0.100 kg
= initial temperature of copper = 100 °C
= Specific heat of copper = 386 J/(kg °C)
= Final temperature of mixture
Using conservation of heat
( - ) + ( - ) + ( - ) = 0
(0.250) (4186) ( - 20) + (0.400) (900) ( - 26) + (0.100) (386) ( - 100) = 0
= 23.63 °C