What is the uncertainty in the temperature difference, ΔT, between the two temperature T1 = (25.0 ± 0.5) oC and T2 = (30.0 ± 0.3) oC?

2. When calculating the density p and uncertainty of the copper block A p, the calculator shows "8.35256" and "0.06532" respectively. The result should be represented as: ( ) (A) p (8.35256 ± 0.0653) (gcm*³) (B) p = (8.352 ± 0.065) (gcm³) (C) p = (8.35 ± 0.07) (gcm³) (D) p (8.35256 ± 0.06532) (gcm -³)

A blackbody (a hollow sphere whose inside is black) emits radiation when it is heated. The emittance (Mλ, W/m3), which is the power per unit area per wavelength, at a given temperature (T, K) and wavelength (λ, m) is given by the Planck distribution, where h is Planck's constant, c is the speed of light, and k is Boltzmann's constant. Determine the temperature in degrees Celsius at which a blackbody will emit light of wavelength 3.57 μm with an Mλ of 5.31×1010 W/m3. The power per unit area emitted can be determined by integrating Mλ between two wavelengths, λ1 and λ2. However, for narrow wavelength ranges (Δλ), the power emitted can be simply calculated as the product of Mλ and Δλ. power emitted=MλΔλ Using the conditions from the first part of the question, determine the power emitted per square meter (W/m2) between the wavelengths 3.56 μm and 3.58 μm.

Report your answer to two decimal places

3. The equation 1.45 in our textbook says that the de Broglie wavelength as a function of temperature is given by 1 Assuming the accepted accuracy for h, R, and m are very high, what is the V3MRT maximum uncertainty in the de Broglie wavelength if AT is the uncertainty in temperature?

Problems Q1: Calculate electrons and holes concentration in a germanium sample If T=300 K, Na-5×10¹%/m³, N₁-0. Assume that n=2.4×10¹⁹/m³. (Ans: 5.97×10¹⁹/m³, 9.65×10¹8/m³)

min where Given the equation p= m =13.75±0.06 and n =0.0787+0.0007. What is the absolute uncertainty in P? Select one: O a. 285±5 O b. 285±8 O c. 285+7 O d. 285±6

An atom of iron has a radius of  156. pm  and the average orbital speed of the electrons in it is about  ×5.7*10^7 m/s. Calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of iron. Write your answer as a percentage of the average speed, and round it to 2 significant digits.

(89) X 0 馄.all 89% 12:40 PM Homework 1 PHYs 2100-09-LAB, SPRING 2019 NAME CIN Question 1. A bird flies a distance of d- 150+3 m during a time 20.0+1.0 s The average speed of the bird is u-d/t = 7.5 m/s. what is the uncertainty of u? Question 2. Suppose that we're able to eliminate the uncertainty in our time mea- surement so that t = 20.0 ±0.0 s. What is the new uncertainty of u?

A = 2 X 1025, B = 4.5 X 10-10, C = 3 X 10-6. AB/C = ?       (2) ACB = ?       (3) The Moon is approximately 400,000 km from the Earth.  An atom of a certain element has a diameter of 4 X 10-8 cm. Given 1 km = 1,000 m and 1 m = 100 cm, about how many atoms of this element can be lined up between Earth and Moon?             (4) A spherical planet has a radius of 2,000 km and a mass of 1025 kg. Calculate its density (mass/volume) in kilograms per cubic meter.           (5) How many of the atoms in Question (3) can fit within a spherical planet with a diameter of 2 X 104 km?           (6) An asteroid’s radius is 200 m and its distance from Earth is 107 km. What angle in degrees (θ) will it subtend? Use the equation  θ = 57 (diameter) / distance