Exams & Certification
A metal foil has a threshold frequency of 5.45 x 10^14 Hz. Which of the colors of visible light have enough energy to eject electrons from this metal? – red – blue – indigo – green – violet – orange – yellow Question Source: McQuarrie, Rocki, and Gallogly’s General Chemistry The Correct Answer and Explanation […]
A metal foil has a threshold frequency of 5.45 x 10^14 Hz. Read More »
A metal foil has a threshold frequency of 5.45 x 10^14 Hz. Which color of visible light will not eject electrons from this metal? a) blue b) indigo c) violet d) orange c = (wavelength)(v) 3.0 x 10^8 m/s = (wavelength)(5.45 x 10^14 Hz) 550 nm -> releases green. So, I am guessing the answer
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explain weathering mention the factors that affect the rate of weathering and soil erosion The correct answer and explanation is: Weathering is the process by which rocks are broken down or altered by natural forces over time. This process leads to the formation of soil and the gradual degradation of rocks at or near Earth’s
A container of cream cheese weighs 250 grams, which is equivalent to 8.8 ounces. Calculate the missing conversions. Grams Ounces 250 8.8 a0 11 1,000 a1 The Correct Answer and Explanation is: To solve this conversion problem, we need to use the conversion factor between grams and ounces. We know the following: Step 1: Calculate
A container of cream cheese weighs 250 grams, which is equivalent to 8.8 ounces. Read More »
A company wants to set up single sign-on (SSO) without passing credentials through to each piece of software and cloud service. Which protocol would meet this requirement? The correct answer and explanation is: The correct protocol for this requirement is SAML (Security Assertion Markup Language). Explanation: Single Sign-On (SSO) allows users to authenticate once and
What color do acids turn litmus paper? pink red yellow blue The Correct Answer and Explanation is: Acids turn litmus paper red. This reaction occurs because of the pH of the solution. Litmus paper is a type of pH indicator that changes color depending on whether the solution is acidic or basic. When an acid
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One drop of water from a medicine dropper has a volume of approximately 0.050 mL (1 mL = 1 cm3) a.) Determine the number of water molecules in a drop of water. (The density of water is 1.0 g/cm3). b.) How many H atoms would be present in these molecules? The Correct Answer and Explanation
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If the generation time of a bacterium is 10 hours, and you incubate 100 cells of this bacterium for 20 hours, how many cells will you have at the end of the 20 hours? Group of answer choices 10 100 10,000 20,000 The correct answer and explanation is: The correct answer is 10,000 cells. Explanation:
The Ka for vitamin C (also known as ascorbic acid, C6H8O6) is 8.0 x 10^-5. If 15 g of vitamin C is dissolved in 1.00 L of water, what is the pH of the solution at equilibrium The Correct Answer and Explanation is: To find the pH of a vitamin C solution at equilibrium, we
Because you can easily think of examples when someone got injured at school, you conclude that schools are dangerous places. That reasoning is an example of what? a. Categorization by prototypes b. The availability heuristic c. The framing effect d. Functional fixedness The correct answer and explanation is: The correct answer is b. The availability