The energy per einstein of the light in cal mol- of wavelength 4200 Å is
a) `6.807 times 10^4`
b) `6.35 times 10^4`
c) `1.43 times 10^5`
d) `1.14 times10^5​`

The average thermal energy of oxygen at a temperature of 27C (А) 6.2times10^(-21) J (В) 4.5times10^(-21) J (C) 3.5times10^(-21) J (D) 1.2times10^(-21) J

A ball of mass "100g" is moving with "100m/sec" . The wavelength is (A) 6.625times10^(-28)m (B) 6.625times10^(-35)m (C) 6.625times10^(-30)m (D) 6.625times10^(-24)m

The wavelength difference of light waves of the wave numbers 2 xx 10 ^6 per m and 2 25 xx 10 ^ 6 per m is

Simplify: 10^(-1)times10^(2)times10^(-3)times10^(4)times10^(-5)times10^(6)

3^(-5)times10^(-4)times(5^(4))/(5^(2))times6^(-5)=

Calculate the energy in joule corresponding to light of wavelength 45 nm : (Planck' constant h = 6.63 xx 10^-34 Js , speed of light c = 3 xx 10^8 ms^-1 )

The energy of X-ray photon of wavelength 1.65 Å is (h=6.6 xx 10^(-34)J-sec,c=3xx10^(8)ms^(-1),1eV=1.6xx10^(-19)J)

Henry 's law constant for the solubility of N_(2) gas in water at 298 K is 1.0 xx 10^(5) atm . The mole fraction of N_(2) in air is 0.6 . The number of moles of N_(2) from air dissolved in 10 moles of water at 298 K and 5 atm pressure is a. 3.0 xx 10^(-4) b. 4.0 xx 10^(-5) c. 5.0 xx 10^(-4) d. 6.0 xx 10^(-6)